Malicious PDF — malware analysis report

Static analysis result for SHA-256 8468f73c49ada81a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 04:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9481dbd4f5e5382891934761c62c9f SHA-1: 8a9166a01233d5f352f7bcabdc018e515ef33080 SHA-256: 8468f73c49ada81a8fd7263c991ada69e5d849e824ae5e4073b210ef96b95877
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=burnaby+school+district+registration+form`. Additionally, it features a PDF link farm with numerous external links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and other URLs that are part of the link farm.

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=burnaby+school+district+registration+form
    • http://files.polarissecurityconsultingllc.com/uploads/1/3/1/3/131378950/9ed9589b18d656c.pdf
    • http://tuvoxajeb.donkerandguests.com/uploads/1/3/1/4/131407406/nitatadusaso_nubukobulo_papasosof_gejonaf.pdf
    • http://nonese.hopeofglorychristinmebriankinnett.com/uploads/1/3/1/4/131453384/2830422.pdf
    • http://sanidazev.allseasonsironworks.com/uploads/1/3/0/9/130969959/28cb1.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/acunetix_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6502/4416/files/kubolidaduledexixag.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7688/files/vigitixekop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8599/files/67840096069.pdf
    • https://cdn.shopify.com/s/files/1/0430/8113/8343/files/gefileburilokufezivukup.pdf
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/rowagezipadopofawikavo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2942/8384/files/23512946183.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/zijemewuwilasokoge.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7189/files/jafagiwukewuwonir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/vefute.pdf
    • https://cdn.shopify.com/s/files/1/0432/8433/2710/files/1400_calorie_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4339/files/mosuduxim.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_off000060b5.bin
70223bd3aeee5598e03f7e7c1304605071ed8d8348f8a97350bea4f775ed99c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 5728 bytes
font_01_sfnt_off00007409.bin
adec09ed3a50715e939c4bd803b86c6b49961052c3292718f5c4c54c4760560a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7409 10512 bytes

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