Malicious PDF — malware analysis report

Static analysis result for SHA-256 077cd4b4466cb199…

MALICIOUS

PDF

73.1 KB Created: 2020-07-30 12:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f948c9764facb0c73113a885f226b7 SHA-1: 66074d09f258f1e8b555be2c4587283159fabaee SHA-256: 077cd4b4466cb19973443a89109c2d17f6fd9a8bbe50aa428df61ee209c55c93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to downloading a constitution, suggesting a lure for users seeking specific documents.

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.ru/pify?keyword=south+african+constitution+pdf+free+download
    • http://files.cielogiftbaskets.com/uploads/1/3/1/4/131437941/zeretevo.pdf
    • http://files.bullvilleanimalhospital.com/uploads/1/3/1/4/131406082/kerowofow.pdf
    • http://files.moveptwellness.com/uploads/1/3/0/9/130969580/1a8888c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/447463329.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/14469581204.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/49719610523.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/vogojiloju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/xivebubarome.pdf
    • https://cdn.shopify.com/s/files/1/0432/4530/6011/files/logirotofor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/1093724680.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/zusixilura.pdf
    • https://cdn.shopify.com/s/files/1/0438/0724/4450/files/55155896674.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/46668871323.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/likixetok.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/24161675852.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/57409964146.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1cf.bin
d4b7d85bccf6298a9b1424fb19fc4bdfbd81400b2302b24e5c07beec5c9dc8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 5320 bytes
font_01_sfnt_off0000f3ed.bin
5039d5e899f00e379f21849f434d032d43d4df0c7db41b110aaa5737c2449b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 10208 bytes

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