Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeac686bfdf7a3bb…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 18:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dadcf89ffb6baeb1cf294ce30a0d7d6d SHA-1: 3c9b685bce18d6856a3f54d4b3e3412f4ae7bbdb SHA-256: aeac686bfdf7a3bbe8fdc59bb580ea42dea6f1d0ce396739cc1bf01efdef2e41
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to shopify.com domains, but one critical link directs to a known malicious redirector infrastructure at ttraff.ru. This suggests the document is designed as a link farm to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=ficha+tecnica+accent+hatchback+2018+pdf
    • http://jeseso.ronkachelmeier.com/uploads/1/3/2/7/132710575/492e0ea.pdf
    • http://rekawefol.earthenshelter.com/uploads/1/3/0/9/130969192/5552224.pdf
    • https://cdn.shopify.com/s/files/1/0431/4238/1725/files/27642382280.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4422/files/52663040914.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/90251853943.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/xutivipivezomufek.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/mapebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/97496996490.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/dininakekodawa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/zufabamazo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/american_english_slang_words.pdf
    • https://cdn.shopify.com/s/files/1/0430/3575/4650/files/jolomekedovuz.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_off0000641d.bin
2a4d1a65a89130ed8bcb240d77c26e8debc720e316342008dc8bb9568f47e29f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 5616 bytes
font_01_sfnt_off0000772b.bin
55e6d4431356d5846b93aab9be83f86e432eafe010ce5320a38f05e9d0047995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772B 10424 bytes

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