Malicious PDF — malware analysis report

Static analysis result for SHA-256 86687a937c015645…

MALICIOUS

PDF

42.1 KB Created: 2020-07-25 19:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 745c6e17758444cf44d85ff048822760 SHA-1: 6bee89049f1f0cb7624d21aabcd66827a7a22712 SHA-256: 86687a937c01564597069a2339ce889f1dcbe2e546756a5633a10e336807d6da
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including a critical redirector link to 'ttraff.cc' and a link farm pointing to various PDF files, some hosted on Shopify. The document body, though heavily obfuscated, suggests a lure related to downloading software. The presence of multiple external PDF links and a redirector indicates an attempt to lead the user to malicious content, likely a secondary payload or phishing page.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=firefox+older+version+for+windows+10
    • http://files.lessons-by-alex.com/uploads/1/3/0/7/130775063/genupaxeju-zoxefejinezuvo-gezepabafelar-kifikiji.pdf
    • http://files.robbfreemethodisthistoricalcentre.com/uploads/1/3/0/9/130969657/tusuzevage-tojunabot-sijinekuxu-budam.pdf
    • http://files.pharmalauren.com/uploads/1/3/0/8/130814003/4770891.pdf
    • http://files.guitarhugs.com/uploads/1/3/2/7/132712129/fetul-rimerosakubaso-kevilali-kupoxijogi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/41786135085.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/vujug.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/jonuzoxirakexored.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/71738604826.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/63506381545.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/65015729236.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5752/8480/files/bifogili.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/bifudexemaxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65105912314.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.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_off000067c9.bin
6a2af972bd05262dff9f715b73502807a01b8d8f52ac7e4d1ca8479ccd26f9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C9 4768 bytes
font_01_sfnt_off0000781d.bin
566bdf15bc0ad8780f57c61f0d2cfce9bed075232a2d12c200eb6901bbc514c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781D 10708 bytes

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