Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92713c2c62200b…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 08:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ba6e15165d98d58416d77471e351d80 SHA-1: 0f616771ce5388673b8c3469709187654dc38f8c SHA-256: de92713c2c62200b4ab3b3ca6501fd9be2860f3a032dcb88403055b6c5acba6e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=convert+pdf+to+word+with+ocr+online+free'. This URL is designed to lure users into clicking it by appearing to offer a useful service. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The presence of many links to external resources, including benign Shopify URLs, suggests a link farm or SEO poisoning tactic to increase visibility.

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.com/pify?keyword=convert+pdf+to+word+with+ocr+online+free
    • http://files.thenookdcp.com/uploads/1/3/1/8/131871633/14357340f.pdf
    • http://lukaramo.postopweekly.com/uploads/1/3/1/3/131398367/f4cd73.pdf
    • http://files.suncitysnack.com/uploads/1/3/1/4/131453060/fipovatugip-pajeximavimu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0184/5659/files/blood_cancer_report_file.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/91526676654.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/gesiku.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/jodisixoxanuronupabat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3822/0181/files/xiwabetaroxebuwibosibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2077/files/jixunitibofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/tagumujanenitozivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/tivimunemuver.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7423/files/sugukal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/kelomigiwolas.pdf
    • https://cdn.shopify.com/s/files/1/0450/5419/7910/files/classificao_dos_actos_de_comercio.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_off00005bcf.bin
e56602fa47978affec7bbe6b63c90988c7d337de221f2b1351f69727a82a511f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCF 4816 bytes
font_01_sfnt_off00006c42.bin
e1ffb4dd84107e1074a53fff2aa837d4bd56100ed26b1dfdaa72c827065f3f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C42 11140 bytes
font_02_sfnt_off000090d6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D6 4324 bytes

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