Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fed0af90713725…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 16:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 395dcd875ff985f0ae80ecd19ec69789 SHA-1: 71e6847540e78a9adc2f122f4807f3fd9fd13297 SHA-256: b4fed0af90713725e29fd1a2c7d83079b5ed6bf7a7f4de0e25b581a0a7ba115c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. The primary attack vector appears to be luring users to click on these links, likely leading to further malicious content or downloads.

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=line+symmetry+worksheet+pdf
    • http://files.janenodine.com/uploads/1/3/0/7/130738720/e060ea2c19.pdf
    • http://files.vibranceguitars.com/uploads/1/3/1/4/131438142/kujugewov-xatipipuvedinod-moropugewuput.pdf
    • http://files.mrtranhistory.com/uploads/1/3/0/8/130814009/c47c18e7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/75507011061.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/892498433.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/94085292546.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/93235493027.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/metabolismo_de_aminocidos_e_protenas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/sixteen_tons_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mowajuvide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/bivatasozajenadeso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/94642131048.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/ruwuxosararasilasuzurepuk.pdf
    • https://cdn.shopify.com/s/files/1/0440/5483/9461/files/zikudadanunifegonuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/gotemavexakitefesaxuze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057d8.bin
e2530f605f3034317c9d5e88e435bfc3a3e8c5438f1be09ca1fb3aab959c3de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57D8 5028 bytes
font_01_sfnt_off000068dc.bin
838b466a531764c703d56b382c5c74bd0e8e4212361f33211f8fb5e0498e1c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 10396 bytes
font_02_sfnt_off00008bcd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCD 4324 bytes

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