Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55dc3df91f9ffbc…

MALICIOUS

PDF

75.6 KB Created: 2020-08-07 02:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14d38bf3f082e29ace79e84ef07bec9 SHA-1: 07f66bdd4043a1ab47e9adf3c095ae892c6744c2 SHA-256: d55dc3df91f9ffbc62e6bdb7f07be33e1a89622ece47c34d507c7caa0e24f8fa
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain the malicious URL. The presence of multiple embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to distribute content or lure users to external sites.

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=cardiomiopatia+dilatada+perros+pdf
    • http://zelini.grassroots-institute.org/uploads/1/3/0/8/130874038/varatukepuruxoj_sudadu_gedibabixul.pdf
    • http://files.hairytalestudios.com/uploads/1/3/0/7/130775758/625ed62a4f02676.pdf
    • http://files.porncolection.com/uploads/1/3/1/6/131606262/babijisukeso_ravivuruwi_riwonukuvejuw_vufibes.pdf
    • http://files.amselectric.com/uploads/1/3/0/7/130776295/5848817.pdf
    • http://wukodi.ninsandneedles.com/uploads/1/3/1/0/131071157/relezinefelok_bawetamafozizi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5190/0310/files/86677005166.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/sitonofarekalazuviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/2834/0123/files/52793138761.pdf
    • https://cdn.shopify.com/s/files/1/0434/3778/5240/files/53132258530.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/46767599706.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5514/files/4243025920.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/vagotefubek.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/98482289751.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/26766591935.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/sigefu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0046/1474/files/2329431581.pdf
    • https://cdn.shopify.com/s/files/1/0440/1584/5541/files/79271208203.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/lojopotiporoxo.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_off0000de53.bin
e29ec0f4f44d7898beba75d59adee16811139e67bbdacc5ac5b5e410811070a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 4892 bytes
font_01_sfnt_off0000eefc.bin
6ff1b7f5f7db655a881b8dde4acf7120668bf368b6b37853f556f6a01d8df468		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 10500 bytes
font_02_sfnt_off000112ca.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 4324 bytes

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