Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a98eb06a28c7e8…

MALICIOUS

PDF

36.1 KB Created: 2020-08-10 16:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a84c1df7c8c0d7a26dd1cbb5b77baf23 SHA-1: 93e5c0e65dd947614d5e99a49f854ac473ab0a47 SHA-256: 73a98eb06a28c7e8fa109faf83a146da0b23bc7618a5968f498f21200fc7c66f
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 known malicious redirectors or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://ttraff.cc/pify, which is used to redirect users to other sites. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for educational content.

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.cc/pify?keyword=irregular+plural+nouns+worksheet+pdf
    • http://luwiripon.tntelitesportsacademy.com/uploads/1/3/1/1/131164048/buwopodedinibomo.pdf
    • http://files.oasystec.com/uploads/1/3/1/4/131408432/degotosamo_bexavolejaz.pdf
    • http://files.benmoorestudio.com/uploads/1/3/0/7/130775690/8462354.pdf
    • http://files.raisingrain.com/uploads/1/3/1/4/131438059/pefovatax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/sopuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/pukowodurukuwususegodef.pdf
    • https://cdn.shopify.com/s/files/1/0437/3266/4481/files/21372912353.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/80695797226.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/80750317662.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/34371498745.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/51306955739.pdf
    • https://cdn.shopify.com/s/files/1/0436/5081/0014/files/25232290197.pdf
    • https://cdn.shopify.com/s/files/1/0437/7346/0641/files/49957368917.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxupajajivamuwiri.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8213/files/zozefuzexekeku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000450e.bin
96e1bcf78debeb0ca5c13fed73bd7f0496cb3dc61ad13b53caded16e4271ceaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x450E 5228 bytes
font_01_sfnt_off000056da.bin
2780ee1faa2330615447e34d65ffdbd5dc343500b69a27531afa44a083e94e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56DA 8920 bytes
font_02_sfnt_off0000754b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 4324 bytes

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