Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0908606fd16bccb…

MALICIOUS

PDF

42.2 KB Created: 2020-08-12 14:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9cfd5bd47c8e98f9e2cfb35b62d34c5 SHA-1: cfd3540af5a50205ad7777313125394aabd284e2 SHA-256: b0908606fd16bccb279cf5e595e3c19d1d77a8d3de2c8664b219d50ac93d9162
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=abelian+group+examples+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and several other PDF links, reinforcing the attack pattern of luring users to external sites.

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.cc/pify?keyword=abelian+group+examples+pdf
    • http://files.bluehorizoncvs.com/uploads/1/3/1/0/131070166/5c32f49.pdf
    • http://files.detoncho.com/uploads/1/3/0/8/130874369/e680ca12b248.pdf
    • http://files.prompt.ca/uploads/1/3/0/7/130776779/kelava.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/63660203191.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/53736292162.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0739/files/vebikususitomefutamafuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/79103149223.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/tatagovudoperewotezedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/buttinette_katalog_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/45606524255.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/57959904269.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/naruwikomokunadej.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/homework_latex_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/kezakerobesat.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/xekukitavex.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_off00006719.bin
029f6cc9fe33f2bdd51dec3c0a2abbc92a8f2925dc9aa7ad28121414981f6cb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6719 5556 bytes
font_01_sfnt_off000079e7.bin
13ee06d8f958de3438846a591a4b929c602f7ecb08c0298aaef6f08bcd69c165
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E7 10076 bytes