Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff35ea49727bc6c9…

MALICIOUS

PDF

47.6 KB Created: 2020-10-27 10:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc71ccb137ef6159351b1987a3cb9a71 SHA-1: 361958e88123a3cc3ff2116537d32280d9321d13 SHA-256: ff35ea49727bc6c9b52a5702e3040654d639853672e2c92c9ff4868b6d2e5214
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The primary redirector URL, 'https://gettraff.ru/strik?keyword=the+bible+as+literature+an+introduction+pdf', is flagged as malicious. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites under the guise of providing free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=the+bible+as+literature+an+introduction+pdf In PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/917616.pdfIn PDF document text
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/1533311.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/54c9162ea12.pdfIn PDF document text
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/cf485751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/82903372731.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/billing_system_project_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/78878258477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2908/6887/files/gumozadipeti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2626/7291/files/83056509631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/sig_sauer_p320_romeo_1_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/82608105880.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0697/4909/files/manual_ministerio_da_saude_leishmaniose_tegumentar_americana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/apn_movistar_chile_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd303f63-9063-43bc-a3be-a08358ae47c3/72361360504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a659f0bf-dfe3-4d6d-997a-0ae43287a408/1631297514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b14652b-baa9-46f0-a46d-147e01ca1b41/14659057924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38d26a2-6510-4d6d-904a-c76b6e659ce0/flutec_flow_control_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b981faf-9bdf-489a-9903-6481f1a3a5d7/popoxawodagugixik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202ff56a-a8f2-448b-a345-e04608983801/32560723441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0310ce74-1593-4204-8c0c-10309d2b73cc/4014325909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c66424-6570-4484-89c6-59d2361a3376/8235104411.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7968 5332 bytes
SHA-256: 6459aaa6c99794be463958f672da246e8ab2f3ed0c3bd7ca6b6e4208f7782a54
font_01_sfnt_off00008b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7A 10948 bytes
SHA-256: bf8dc304a7e23e13a74950a6f1271970aca701ba8342188c5086c9702c9a5ded