Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5c84f150a03a94…

MALICIOUS

PDF

43.3 KB Created: 2020-08-12 16:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18743f66eaa51e63735321cf81e58f13 SHA-1: 8831376f4807f31242d2b714b49414c809522037 SHA-256: 7f5c84f150a03a94373cfbcd0e1e71967d8d22413902a13399dc497a3ee191de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link directs to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, suggests a lure related to 'speech notes'. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=speech%20on%206%20september%20in%20urdu%20with%20poetry%20pdf
    • http://tepulibux.ejhayesorchestra.org/uploads/1/3/0/7/130775085/af610708.pdf
    • http://xovatinen.jessicaluni.com/uploads/1/3/1/4/131482952/linowufakuzijuxub.pdf
    • http://files.mountainestatestea.com/uploads/1/3/0/7/130739852/5705713.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/mitesafikimumikuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/72665289368.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/85892506273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/98572930349.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/32700645432.pdf
    • https://cdn.shopify.com/s/files/1/0438/9873/2696/files/complete_english_punctuation_rules_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7787/files/exidy_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/1493563034.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/gurifekewosa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4802/files/gilulakixofetin.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/30425547092.pdf
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/kawasaki_ninja_500r_service_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eeb.bin
9dcf737792f24e063cf176cb116198862001440b57a8ef96332363eb0f68e8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 5744 bytes
font_01_sfnt_off00007258.bin
6f0503c1c4e8d5fb97838406f88c72edae23af1896bcd52d3526b3b9adb53651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 14992 bytes

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