Malicious PDF — malware analysis report

Static analysis result for SHA-256 1379a617120ecdb8…

MALICIOUS

PDF

44.9 KB Created: 2020-08-11 23:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d8103677b221dd2d6e3d1a1306b803 SHA-1: ba8045db6f5d4bf953f2bf63b5b53b4f47a4b1b9 SHA-256: 1379a617120ecdb8344f04bcc22bb21d78b33545f2cc0da75b434d2365d72c3d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'access control pdf download' and includes the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.ru/pify?keyword=access+control+pdf+download
    • http://files.88jamz.com/uploads/1/3/2/6/132696154/cc780a9911.pdf
    • http://files.meteorcruise.com/uploads/1/3/1/3/131384429/lelisov_wusurovewelan.pdf
    • http://files.montanafriends.org/uploads/1/3/1/6/131637108/3913827.pdf
    • http://files.howmayihelponline.com/uploads/1/3/1/8/131856170/9835575.pdf
    • http://files.forrestcityapartments.com/uploads/1/3/1/4/131453484/9189544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/56636024455.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/vetugunemizasurefibamaxa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/nodolupijorakadosirurupup.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/blague_de_tonton_liste.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/translate_english_to_russian.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/fixududuvasapapevimibuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/rusimilava.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6498/files/tipidutikuduve.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/94776047328.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/viluvogisenukoxazer.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/kosuvosumazuwutu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0430/2071/4137/files/crystal_chest_minecraft.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_off00007030.bin
019ac80250aa62242cb032ca375e960ad3ef6a1f543148db94789cb680b20573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7030 5228 bytes
font_01_sfnt_off0000820f.bin
83cf301c1ba529b57aa3e0f6b96717549f9c9228e9bf64a999acda4f3bfd4e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820F 10700 bytes

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