Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b61564f04e4264f…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 02:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f220ec5dd6e43ad7190249d4bb962eef SHA-1: ebf2932c59c63563fbc5705ac5d26f69ffed6e14 SHA-256: 1b61564f04e4264fcc01b5fdc51e55d9bd170153bc86437ae52c80a850b9a7c6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious link being https://ttraff.cc/pify?keyword=lista+de+valores+y+antivalores+definicion+pdf. The document body, though partially corrupted, contains this URL and appears to be a lure related to 'lista de valores y antivalores definicion pdf'.

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=lista+de+valores+y+antivalores+definicion+pdf
    • http://files.roofglo.com/uploads/1/3/2/6/132681508/rowelateradofaxosabi.pdf
    • http://files.studentprivacy.org/uploads/1/3/0/7/130775953/timamod.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/steeple_analysis_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/4237/3785/files/how_to_rearrange_pages_in_adobe_reader.pdf
    • https://cdn.shopify.com/s/files/1/0446/0537/4628/files/66883105568.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/84065322658.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/49091241251.pdf
    • https://cdn.shopify.com/s/files/1/0432/3193/6674/files/rixujopeserib.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/14256301103.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/lilokezifewosojet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/39700983899.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/55093213726.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jezimix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/98658481188.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/bsa_communication_merit_badge.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/alcohol_en_gel.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_off00006841.bin
b28d857691519c0a43736245796500f23b864cb5416d629b01a80464c8666d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6841 5252 bytes
font_01_sfnt_off00007a36.bin
be2ac216c7a8dc1b3fde61e588d9491e80c7c78977f48a902c818c32d77cc9e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A36 10704 bytes

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