Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dfe4c9c1de2944…

MALICIOUS

PDF

71.4 KB Created: 2020-08-10 04:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88d788bc83d8d230adf22f59a324536 SHA-1: 479978ae0792e48c8f42d6252ba243b897010e07 SHA-256: c5dfe4c9c1de2944dc8b66976cacc3bacf0b5f2ccd8ce05743b0d94818179438
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. This indicates the PDF's purpose is to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

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=broca+s+aphasia+pdf
    • http://files.michaelbrownslawoffice.com/uploads/1/3/1/4/131406762/xajixolaxexojobegu.pdf
    • http://files.belfastdrivered.com/uploads/1/3/0/9/130969562/fazules-zegupak.pdf
    • http://tafepojob.grasshoppervapesllc.com/uploads/1/3/1/1/131164250/rugovexopejamijom.pdf
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdf
    • http://files.heartxoutfitters.com/uploads/1/3/0/8/130814342/5789527.pdf
    • https://cdn.shopify.com/s/files/1/0440/5778/8568/files/46010852305.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/wirurajumigexekekavif.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/36093236027.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/zezopixonow.pdf
    • https://cdn.shopify.com/s/files/1/0439/2694/5947/files/bmw_z4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4568/files/mathematics_syllabus_d_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0436/4461/6864/files/vavavukovekujixadesise.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/dubavinav.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/3994116212.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/69675862580.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/16532795672.pdf
    • https://cdn.shopify.com/s/files/1/0433/2634/1278/files/5896628643.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/28777750519.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_off0000d9f5.bin
6a570e3b2ad05f125c506501bfba2044f5622fe06e3ecdcfda273b71a58fbc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 5260 bytes
font_01_sfnt_off0000ebcf.bin
200b4b3ce141cdf4a573caa9afa0f2cc8de43c785a54f9d3b770d3a543a7dde4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 10676 bytes

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