Malicious PDF — malware analysis report

Static analysis result for SHA-256 154be5fb17147c63…

MALICIOUS

PDF

102.9 KB Created: 2020-08-05 17:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18a82ad81fbbad894d1b2db35746f6f5 SHA-1: 6f8f6beed53b1a209a570a70e09707d2c0514178 SHA-256: 154be5fb17147c6397d175bded27e034bd909f20b4d3b1245b97847ee6863d73
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=20+amino+acids+names+pdf'. The document body, though heavily obfuscated, contains a reference to this URL, suggesting an attempt to disguise malicious content as a benign PDF. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=20+amino+acids+names+pdf
    • http://mirixasad.jasontoonwrites.com/uploads/1/3/1/4/131407995/2204940.pdf
    • http://files.elmbankrabbitboarding.com/uploads/1/3/0/8/130873795/bivimagenojigutu.pdf
    • http://files.step-by-step-declutter.com/uploads/1/3/1/3/131380471/5081074.pdf
    • http://pukelevi.juliannawells.com/uploads/1/3/0/7/130775607/nudalegubofolasim.pdf
    • http://files.dplusworldwide.com/uploads/1/3/0/7/130775432/c39ac7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/65087496525.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7430/files/21501545062.pdf
    • https://cdn.shopify.com/s/files/1/0437/6169/6925/files/lajovubogetegazumele.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/73780448481.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8023/files/purevpn_vs_ipvanish.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/5467123974.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/jubogokafujamafezepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/dajamafedalalakepujeto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/54984279502.pdf
    • https://cdn.shopify.com/s/files/1/0431/0781/1495/files/minecraft_shading_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/dukutubuwetorexilulof.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/bewafesexidozujuzafuvut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/nuzaxukosagug.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/10th_class_biology_book_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/17473860828.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_off00014479.bin
b74f661223aa2747cb3c96ac0f4e08da631402bff80923420fe2edce47589aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14479 5060 bytes
font_01_sfnt_off0001557f.bin
f43a4a66132ee609edb5d4ed12b7169bbea6c68f6c4bd368fe5275a3e5d2acee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1557F 13172 bytes
font_02_sfnt_off00017ffc.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFC 4324 bytes

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