Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c8ac153948b682…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 08:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 93a48f70c8829f1c5be5a60aa87f131c SHA-1: b52eb1cf3a2cdeed93ace8d17f3e261d2cc96d29 SHA-256: 56c8ac153948b682f0b1667b91eb670794744feb3bc3683ab2e57d4752a16921
194 Risk Score

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://ttraff.cc/pify?keyword=bluestacks+mac+os+x+10.+6.+8 In PDF document text
    • http://lejasa.cpcavies.com/uploads/1/3/1/3/131398362/c7b2ba842cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6114/8832/files/wedupopujej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/25854306804.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/discipline_and_grievances_at_work_acas_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/givifazerezukavapagagirid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0872/1049/files/lawewulalifamadis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/0955/6899/files/ammonium_formate_buffer_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/sociology_introductory_readings_anthony_giddens.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/fuxigeboxawadupimosape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/pakofero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4488/7966/files/nosapigenilejedi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/middle_school_vocabulary_words.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_off0000673e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 5604 bytes
SHA-256: 6ddb903d8736fd748812b09cf21fe8d9d9abed58108b0378a0f2ac6b95270bf3
font_01_sfnt_off00007a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4D 10200 bytes
SHA-256: bcefd998b236e45af0a9e0bfe055f933622bf340ecc1606c21ae123d571f769c