Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c7f71335d1cdd7…

MALICIOUS

PDF

48.2 KB Created: 2020-07-09 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7c3db7c78bb4aa399bed3f4275352b55 SHA-1: f1913cbc14c68cbddcb44e471df31f48e7bb7cd1 SHA-256: 82c7f71335d1cdd7e4467af447122bd80322f3f629582dd05526b29b1bcac323
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to redirector infrastructure like 'ttraff.com' and a link farm hosted on 'pjeterkoleci.com'. This suggests the document's primary purpose is to direct users to malicious websites, likely for phishing or to download further malware. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=peel%20me%20a%20grape%20diana%20krall%20pdf In PDF document text
    • http://files.pjeterkoleci.com/uploads/1/3/2/6/132681938/f414f68e3faf.pdfIn PDF document text
    • http://files.annagalatirealtor.com/uploads/1/3/0/7/130776718/979473.pdfIn PDF document text
    • http://files.seizediem.com/uploads/1/3/1/4/131438741/vewim_gifesimefipotu.pdfIn PDF document text
    • http://files.corinnehollowayart.com/uploads/1/3/1/8/131872015/4f5ce6.pdfIn PDF document text
    • http://files.thecharagroup.com/uploads/1/3/0/9/130969294/13ed209530.pdfIn PDF document text
    • http://files.elitegymsamui.com/uploads/1/3/1/0/131069910/9074f65.pdfIn PDF document text
    • http://files.norawickman.com/uploads/1/3/0/9/130969907/6315497.pdfIn PDF document text
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdfIn PDF document text
    • http://files.sanmateolimos.com/uploads/1/3/1/3/131383553/612544a.pdfIn PDF document text
    • http://files.albadrivingschool.com/uploads/1/3/1/4/131406835/rivavugomajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lezuvovefoga.files.wordpress.com/2020/07/dikabatubuzix.pdfIn PDF document text
    • https://zasolifi.files.wordpress.com/2020/06/98286203513.pdfIn PDF document text
    • https://tijitote.files.wordpress.com/2020/06/4957184770.pdfIn PDF document text
    • https://ratomanedaz.files.wordpress.com/2020/07/51730012467.pdfIn PDF document text
    • https://juxotig.files.wordpress.com/2020/07/75009441893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ziduvawijixivobufanevi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/medarovadujagowurevasote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetelonum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 5468 bytes
SHA-256: 10db3e2c76c2de398386ee3c040eb0c7acdbf3da5ac5b15417808cd79d0307ce
font_01_sfnt_off0000764c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x764C 4844 bytes
SHA-256: 3b968154192ab75b8b8ccc56db8b7fc38284f43c90d0695c931b7348834cc9f2
font_02_sfnt_off0000869b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869B 14416 bytes
SHA-256: 4fdab4e370c2487b8ecc294e83f255e43bce4da5fa0770bc430f209a61cc12fd