Malicious PDF — malware analysis report

Static analysis result for SHA-256 18321322b38a0452…

MALICIOUS

PDF

40.0 KB Created: 2020-08-05 03:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab32a633f30cf7cf37f96195b7b7dcf2 SHA-1: c1df410349ef6a970870f90716207a07a214f768 SHA-256: 18321322b38a04521ffeaccea77ad0b73b8caa5af2023c83cfa0fa18db9d7d3d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, 'ttraff.com', which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=harvard+referencing+generator+pdf', suggesting a lure to a fake generator. No scripts were extracted, but the presence of multiple external links and the redirector heuristic strongly indicate a phishing or content-luring attack.

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/pify?keyword=harvard+referencing+generator+pdf
    • http://files.homeschoolamericanhistory.com/uploads/1/3/1/3/131381363/c472627.pdf
    • http://files.grainbychriscarroll.com/uploads/1/3/2/7/132740756/zizurazigezek.pdf
    • http://files.mitchellmillermusic.com/uploads/1/3/1/3/131379268/a20251751ae0e5.pdf
    • http://nesiweb.oldnytours.com/uploads/1/3/0/9/130968921/devixala_luwafegik_bifilipojifuru_xetobelebizez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/dowudibefezuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/25190454308.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4485/files/virtual_villagers_4_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/90434586526.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/david_gilmour_set_lists.pdf
    • https://cdn.shopify.com/s/files/1/0440/5071/0693/files/fosajokaxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/28283566674.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/47536513216.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/2744093338.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/subukanazuwaduvebatib.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/wadugunizis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.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_off00005f29.bin
34b155e3427533a30ca7bd9f06e173ad48ea7d155e9af6a05f66c09e0ca8b0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 5136 bytes
font_01_sfnt_off000070bf.bin
3ab943bf4521e4e3dc1738c816f3404ac2c822624d80f43fdd7803497f7c2dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BF 10140 bytes

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