Malicious PDF — malware analysis report

Static analysis result for SHA-256 51646a870e9fe341…

MALICIOUS

PDF

51.6 KB Created: 2020-07-31 22:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377cf995386a185aa23367d589ca8752 SHA-1: 8b6c42969205bcd5d5384c45eac0311d0f6824a7 SHA-256: 51646a870e9fe3417833b91ef12b31d963ec7e97423eadc32966ae1ba3444e79
152 Risk Score

Malware Insights

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

The PDF document contains a deceptive message about a filesystem error, likely intended to trick the user into clicking a link. The primary link, 'https://ttraff.com/pify?keyword=the+root+filesystem+requires+a+manual+fsck', is identified as a malicious redirector. The document also hosts a large number of other PDF files on Shopify domains, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample.

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=the+root+filesystem+requires+a+manual+fsck
    • http://files.ctopcustom.com/uploads/1/3/0/7/130738534/ginoju.pdf
    • http://files.livesavingcleanwater.com/uploads/1/3/0/9/130969997/35479f9.pdf
    • http://files.faithbaptiststacy.org/uploads/1/3/0/8/130814402/gobanegopomelo_gawimegasos_rexap_kisavavu.pdf
    • http://files.lisaspykers.com/uploads/1/3/0/8/130874317/sosaw_xowojetupipum_kutaw.pdf
    • http://files.beyondablonde.com/uploads/1/3/2/7/132740767/duvofekujodif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/48780110753.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/19650769474.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/48393077786.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/43148012830.pdf
    • https://cdn.shopify.com/s/files/1/0428/0752/5542/files/20688127563.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/latest_version_of_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/62195139824.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/85119059989.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/44625723692.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/gokepitoguzipugubixunepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/gepekerarigubikawug.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/79363179671.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_off00008948.bin
5de587235d6cc8e4bbf969f8a6e2cae8f5ee23495d8aa711e44e29bb7b569a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 5360 bytes
font_01_sfnt_off00009b64.bin
96eb5114be01f8eab57dc2498cc430cde0e0f6cc0b21c04653bff4b67bce3b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B64 10948 bytes

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