Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e1f285c5809409…

MALICIOUS

PDF

53.8 KB Created: 2020-08-05 16:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f1577a139b32a5c10217663e1380a5 SHA-1: 85cfdeaf9dd4304e5e2561efb68157aa34731185 SHA-256: a8e1f285c5809409fec3b9e6b3a922498dd63830a3f4a977c3f70a6d79685363
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is likely intended to lure the user into clicking. The PDF_SEO_LINK_FARM heuristic suggests a large number of similar links are generated, likely for SEO poisoning or link farming. 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.cc/pify?keyword=the+art+of+war+book+review+pdf
    • http://files.officesatcranberry.com/uploads/1/3/1/3/131379132/7032381.pdf
    • http://files.townofbradfordwi.com/uploads/1/3/2/6/132695730/bitipoxunuzaw_rokinakir_xolureped_jatabe.pdf
    • http://files.jenniferbetteridgephotography.com/uploads/1/3/0/9/130969429/9893254.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/maxazebi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/51365344153.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/20021258951.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/libros_de_biotecnologia_vegetal.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/xidesulilakixipimidubami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/zosofotafujube.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/somotenixoropunugikuxime.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/hp_m401n_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/rowajeralisenez.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/advanced_java_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/ratol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/xabewefazap.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/gimifofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7480/5148/files/python_dict_remove_key.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_off0000961c.bin
ab88300c64acf1926c4ba260f4a555ae1ad61a8da31b116da58ed8b567da4bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961C 5224 bytes
font_01_sfnt_off0000a7f0.bin
b7a29f1cb80b482d5a720608e5d9b37615a05f221a0c2af2010b097bbdb6f5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F0 10088 bytes

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