Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fde18946b59ccf1…

MALICIOUS

PDF

48.2 KB Created: 2020-08-09 00:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 539aca2f9cf196144419da52329fda16 SHA-1: 2b18ee3cc69688947d5e0a396c0c0dd0d469f674 SHA-256: 6fde18946b59ccf1a52b702e84152b9ae332f48510ecdd8c9fbf0aa7721baa40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but the primary link directs to a known malicious redirector. This suggests an attempt to lead the user to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=bilingue+allemand+fran%25C3%25A7ais+pdf
    • http://files.yvesalizahno.com/uploads/1/3/0/7/130776498/ginetuzenezume.pdf
    • http://files.clearwatermusicserves.com/uploads/1/3/1/8/131856270/3684107.pdf
    • http://files.whatsnextmiddlesex.org/uploads/1/3/0/7/130740231/nelowusudapuxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/foledamuravikusuriworiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/67251975939.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/kazego.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/30502298669.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/mepimidifadokolonu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/accounting_cycle_assignment.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/tejufurex.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/mifegijikigidomotomun.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/ccie_collaboration_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5020/files/can_t_hear_people_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/analog_signal_processing_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4814/7867/files/coelom_in_annelida.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000611d.bin
fd7d593013c423beb2cb97e79a00e318ce475c6f0d827b77f01d7dc32a44592f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611D 5592 bytes
font_01_sfnt_off00007414.bin
518c84b61ad47e7b25c24a19df2201331a8b610c84aa51a80cb020ba367f892e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7414 12092 bytes
font_02_sfnt_off00009aaf.bin
da42e2e81fc411279ebc3ae6b604b39b50533435c928363de3a97568e1863f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAF 16580 bytes

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