Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e783bfee1ebd91…

MALICIOUS

PDF

66.8 KB Created: 2020-08-24 09:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cff4eb56492cfdaa0312588ec7fbd05 SHA-1: a57bdbd06d8e61e4b61e389ccfd0932ae63cb469 SHA-256: a5e783bfee1ebd91ea76b0f7b5d9ccf53b013e26004b836aba786f821fce0341
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=bootstrap+4+contact+form+with+validation+example'. Additionally, another critical heuristic indicates a PDF link farm, with many links hosted on shopify.com, though most appear benign. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=bootstrap+4+contact+form+with+validation+example
    • http://zemik.gamers-news.net/uploads/1/3/0/8/130814328/9704612.pdf
    • http://files.centraljerseydyslexialearning.com/uploads/1/3/0/7/130740571/porunulegatapeji.pdf
    • http://files.jakobshockey.com/uploads/1/3/1/6/131606502/jujivisesuni.pdf
    • http://gidewabo.lsrbooksltd.com/uploads/1/3/0/7/130775047/timotisabogi-gakagevejajik.pdf
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/bioremediation_files.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/hackintosh_mojave_nvidia_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/dewonojoneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/presente_simple_y_continuo_en_ingles_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/suvaxadelipuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/lawalunizelag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/lusapafodikesudatuwagad.pdf
    • https://cdn.shopify.com/s/files/1/0436/9720/9498/files/jifefimovudave.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/92602770963.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/soxijibujuzekotumowofekon.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/79722617227.pdf
    • https://cdn.shopify.com/s/files/1/0433/6785/8334/files/2773699716.pdf
    • https://cdn.shopify.com/s/files/1/0433/4813/2008/files/88023838081.pdf
    • https://cdn.shopify.com/s/files/1/0434/9827/4978/files/79655650758.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_off0000b246.bin
106a54de1624999073783008f52bfba9404dca5b285dd9a0d32c5ef2d1504b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 5752 bytes
font_01_sfnt_off0000c5cb.bin
5d7f1bb93ced00d9dcc58b4fe83f6e84ae262005a72c4d4d6773cb0f669198b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 17280 bytes

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