Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30901d59916f144…

MALICIOUS

PDF

39.4 KB Created: 2020-08-14 06:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5889e37b5bbf4a136567be3126538f8 SHA-1: 8773c0652d6828502b1aace82b3bee611498a039 SHA-256: d30901d59916f14422a962446344b6c0f0e0972cbbebb8a585d45d6ac2e9676a
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a redirector. The presence of a large number of embedded links, many pointing to Shopify domains (some confirmed benign, others unknown), suggests a link farm designed to obscure the ultimate malicious destination. The primary malicious IOC is the redirector URL.

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=army+game++java+mobile
    • http://files.wellsburgchamber.com/uploads/1/3/0/9/130969428/sanor_majafiwe.pdf
    • http://mofubu.sachkiret.com/uploads/1/3/1/8/131856713/9806696.pdf
    • http://files.gooseontheroofoto.com/uploads/1/3/0/7/130739450/fewimabedadogi-fomijadanasis-vaxipupedivep.pdf
    • http://files.talesfromparadiseheights.com/uploads/1/3/0/7/130775506/nibugede.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/ralalonoguwum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74140302582.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/56793044047.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4199/files/gapeluvipoduvuwege.pdf
    • https://cdn.shopify.com/s/files/1/0428/5169/6796/files/gate_agricultural_engineering_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/17373280852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17612659915.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/97048095982.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/61968876113.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/fepuvalugevabataporad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/39400767939.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_off00004dc6.bin
bd108731814ec9cc71d05d551d4a1b39f7961f35813ef8c9bd9db820530ed2d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DC6 4796 bytes
font_01_sfnt_off00005e1b.bin
883a25fb00bbf17e380938e232419d0730774c50e129cef77c04ad452d67fc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1B 10788 bytes
font_02_sfnt_off000082ec.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EC 4324 bytes

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