Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9d7cc86e94eabc…

MALICIOUS

PDF

33.1 KB Created: 2020-08-02 10:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24cb19b1cc337a6c559d88f36ee70275 SHA-1: 49b6d58025b2c33cf5016ec6efec4efaf9ce6211 SHA-256: ac9d7cc86e94eabc23cb9a741cc6dfafae0b743821d7f30cb06d1d9a3640c79f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being https://ttraff.com/pify?keyword=fm+7-+22.+7. The document body, though heavily obfuscated, contains this URL and other embedded links, suggesting a lure to external malicious content.

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=fm+7-+22.+7
    • http://files.justintylerowens.com/uploads/1/3/0/7/130738870/zasin.pdf
    • http://files.serendipityondurham.com/uploads/1/3/1/8/131872104/tirorijo.pdf
    • http://files.azra-india.com/uploads/1/3/1/4/131437064/9056093.pdf
    • http://files.julesdouglasart.com/uploads/1/3/0/9/130969166/8392a6f.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/juvivekuvorarojuwam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/ford_econoline_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2183/6193/files/95779380226.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/78016326436.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/fizev.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2519/files/mufuvexukizuzafekawuvonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/fefupulopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/kibajokulomumavake.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/fibonujinamawot.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/80593040621.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/rokaz.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_off0000472c.bin
15e3d5973fd1b968bda358418ac5f28971671a0bf2c6366e97bc3b2aff47c6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x472C 4544 bytes
font_01_sfnt_off000056af.bin
ebe5832e3cc0e162b56e0e97fa311f1150fb41a2c6ec66eb3df4e344d75abb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56AF 9720 bytes

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