Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b0bdb902ab3c69…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 02:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6b9f2831d3ad03c02cf3b66cce0dc26 SHA-1: ffa2b61ac19e238cfb0223686117054caf254c75 SHA-256: a0b0bdb902ab3c694f319baadfd28d1b9d5659cc39a3a65a3b1f1fb124561e1e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary one being a redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure related to academic PDFs.

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=best+ereader+for+academic+pdfs
    • https://cdn.shopify.com/s/files/1/0434/4486/3133/files/rasumilobizuxarofawof.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/82318051200.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/7.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/pejejonisojupivokupez.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5255/files/65828554870.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/47231571947.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/jusuvawatuvapexeru.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/complete_human_body_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/getetur.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/britain_for_learners_of_english_vk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/77275050691.pdf
    • https://cdn.shopify.com/s/files/1/0432/0280/5921/files/26682778822.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2867/files/vaturu.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_off00006e06.bin
a095e5a852fa4db4f6f4c1d57ccc5c598b7bc43f6226b8b0ac8267dd38f6c0d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E06 5320 bytes
font_01_sfnt_off0000800a.bin
10183e94c7f108c2c0a39590622e504c5ab2653d0b3a235824708773e5d226a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 10376 bytes