Malicious PDF — malware analysis report

Static analysis result for SHA-256 28be027d7fbbaae7…

MALICIOUS

PDF

44.9 KB Created: 2020-07-28 12:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12769c5af22161f9a5e9bd6f91647798 SHA-1: fad039d005a8ad840be9878e612107c49f83827b SHA-256: 28be027d7fbbaae753e8950d09c5565029987548c3382e33c4a695807f2dcdb3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though heavily obfuscated, appears to contain keywords related to political platforms, likely a lure to entice users to click the malicious links. The heuristic firings confirm the presence of malicious redirector links and a link farm structure.

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=libertarian+party+platform+2016
    • http://files.neurology-u-tokyo.com/uploads/1/3/1/1/131164506/7742409.pdf
    • http://files.hwange-schools.com/uploads/1/3/0/8/130813898/2533512.pdf
    • http://files.darasheik.org/uploads/1/3/1/6/131606146/mupetasodin.pdf
    • http://files.jaylethbridgephotography.co.uk/uploads/1/3/1/4/131453252/zinatix.pdf
    • http://files.camstonework.com/uploads/1/3/0/8/130874213/napimumo-viliputajexuvip.pdf
    • http://files.camstonework.com/uploads/1/3/0/8/130874213/napimumo-viliputajexuvip.p
    • https://cdn.shopify.com/s/files/1/0434/1976/2840/files/93844894369.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/96649061840.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/bekudekulunese.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/zixatogeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/23204346460.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/24993430721.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/viropiverimikaxojajafes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/nemijuboxeluz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/pibaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/16372762866.pdf
    • https://cdn.shopify.com/s/files/1/0435/5755/2277/files/19790156006.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/takekogakaz.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_off00007194.bin
1b510ae2de099da5cbf39dea501ab53775f4f723ee2d4262733679dbf60d1864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7194 5320 bytes
font_01_sfnt_off00008392.bin
6480ae9f4efaf79175304a98c2ba8126ec9095dc9436f8426cd80146f01ae03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8392 10132 bytes

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