Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab504584c8b72df…

MALICIOUS

PDF

59.6 KB Created: 2020-08-06 14:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7c6a0d8c9da230fb95036403f0eb5e7 SHA-1: 38d349e0293e6884ef9888bdf209d10fbe4ac2f2 SHA-256: fab504584c8b72df7788dd415ad78e42904ccd88516b56fe31b40dad3efa2c09
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=aleph+paulo+coelho+pdf'. Another heuristic detected a link farm with 30 external PDF links, many hosted on cdn.shopify.com. The document body contains obfuscated text and the malicious redirector URL, suggesting an attempt to lure users to malicious content.

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=aleph+paulo+coelho+pdf
    • http://files.mwri.co/uploads/1/3/1/4/131437983/c7cf21e3cf3562.pdf
    • http://files.yamayasgift.com/uploads/1/3/2/6/132695519/f6b055.pdf
    • http://files.bjswanson.com/uploads/1/3/0/7/130740051/3026702016aaf5.pdf
    • http://xixulapum.immigrationbenchmarking.org/uploads/1/3/1/4/131438641/xuferuvupiloguwemu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/7285915431.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7588/files/38808267248.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3117/files/80338701337.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/faduporezowagimep.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/logosolol.pdf
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/the_thyroid_solution_diet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/rolikojejepowaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/15257985186.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/colorante_amarillo_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/nobovevubafovatozuwozuka.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/c_create_file_if_not_exist.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/characteristics_of_quantitative_research_paradigm.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.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_off0000a042.bin
2d657743aaa92345f108db6d140069121567706b68f490983889fafd234b7d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA042 4604 bytes
font_01_sfnt_off0000aff9.bin
f58c98e8c1fa73895dab2005ecafb5a0712460e60b5cc396101e07aa845c26e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 10364 bytes
font_02_sfnt_off0000d362.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 4324 bytes

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