Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50af4ac90395e43…

MALICIOUS

PDF

41.8 KB Created: 2020-08-05 00:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1af0f651616249dca53c3dfb5fc65f SHA-1: 1d5e694dc8d1e44546a788d49b6865047e3e3df8 SHA-256: a50af4ac90395e4311d407645427e168b41bf66e14775b42f24a5d5e4c7c0d15
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, ttraff.com, disguised as interview questions. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=seller+support+associate+interview+questions+and+answers+pdf
    • http://files.affordablehousingconsultants.org/uploads/1/3/0/8/130874437/aeb1e.pdf
    • http://wapil.slopestyleskiing.org/uploads/1/3/0/7/130739678/wizisu-wivarapa.pdf
    • http://files.catherinesusko.com/uploads/1/3/1/3/131398428/totofebukanopejuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/jaluxesozufigemowel.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/kundalini_awakening_process.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/56649178089.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/97171334685.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/dopavokerenix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/kokewovobibuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/tivotakaxiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/xototivuribijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71482320097.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/extens_c3_a3o_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/52658633976.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/sugepodiloxuru.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/badudetobag.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_off00006427.bin
16428a8dbfe6cb8840882a45d4e3f5826a1908bdbe0ffb0a37eb77f87c9e0f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 5528 bytes
font_01_sfnt_off00007716.bin
7b549a9916a77867354904462ebb4e91ae02d5d49d3d7cdbd31003665afd42c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7716 10088 bytes

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