Malicious PDF — malware analysis report

Static analysis result for SHA-256 0542ef2d77aa814c…

MALICIOUS

PDF

34.8 KB Created: 2020-08-31 11:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b50ecdb70a9243faffbe0f98d7d9b601 SHA-1: 5e491d16732cd4bd66f827ed69c1021cc4b683da SHA-256: 0542ef2d77aa814c4c82d302f4cdbc44d37b2840591dc2a4f752058c926254c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=thompson+center+thunderhawk+nipple+wrench', indicating a phishing or malware distribution attempt. 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.com/wix?keyword=thompson+center+thunderhawk+nipple+wrench
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0459/8556/2786/files/basic_biomechanics_of_the_musculoskeletal_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/91204293258.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/dimaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/gedugasotawuxoraminimep.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/7793481140.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/81880058436.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/66217592837.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/kalsifikasi_plasenta_adalah.pdf
    • https://static.usrfiles.com/ugd/1e32c2_4685d9b26cb64e5fa795686312c76722.pdf
    • https://static.usrfiles.com/ugd/89c6ad_62d498c4b13341cca8085f2da7e081e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a0f57776cd4fff9c020f98b8c7fc41.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc707d8188394feda3da4bf5721843b6.pdf
    • https://static.usrfiles.com/ugd/c63dba_0ef0ae6b3c9b409a86c208bf1f30ae26.pdf
    • https://static.usrfiles.com/ugd/270e53_aa7fe76fc6de4db8a8cc41b23e8d06c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b591ec52d39a4c9f9a80b3a5797639c3.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004896.bin
87eed7738be9c142e5def992dc50c54bb00970edacdf6578b5c78cba58340ba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4896 5416 bytes
font_01_sfnt_off00005ae7.bin
eb9d23782f4becfc82a913d7a453d67d8c32d7e02e62c3a321c54bdcbe3c1604
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 10612 bytes