Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcda4f1d7748fb4…

MALICIOUS

PDF

48.4 KB Created: 2020-08-05 00:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea36a076614cdf92e444218ba0083eaa SHA-1: e29f676bc75cb41587b568b99be0ca1a6ab81122 SHA-256: 1fcda4f1d7748fb41adc4a73410c772a490f24bd9828727cff300bc0d5104931
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link that, when clicked, redirects to a malicious URL. The document body, though heavily obfuscated, contains the same malicious URL. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's a redirector and part of a link farm, suggesting a phishing or scam attempt.

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=coreldraw+2020+shortcut+keys+pdf+download
    • http://files.apowersphotography.com/uploads/1/3/1/4/131483254/4044160.pdf
    • http://files.bernhard-osen.com/uploads/1/3/1/4/131406391/f07fe2.pdf
    • http://files.jimpendergrass.com/uploads/1/3/2/8/132815961/xabixejeje-nenowapiwage-jisematonalon.pdf
    • http://files.bingocompany.net/uploads/1/3/1/3/131379612/d2857f2095895b.pdf
    • http://files.gillianbuckleyartist.com/uploads/1/3/1/6/131637257/e492a.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6960/files/vonam.pdf
    • https://cdn.shopify.com/s/files/1/0432/5444/8286/files/59609598105.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/mutexulupobito.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/budatinejige.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/fitaresisazefolela.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/anemia_penyakit_kronis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/17059564634.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/67527215703.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/93716857882.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/como_hacer_un_aserradero_portatil_para_motosierra_pdf.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000784e.bin
f96b5e3fe33b005848cb9a863736cc4650465bdbe1bd8a8e96fb0f0032ac58f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x784E 5680 bytes
font_01_sfnt_off00008bb3.bin
b0c3f68b3589255a7d6c67b0d070af408f848296cff308a072b549cb405b5616
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 12860 bytes