Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a359d8e27d99d6…

MALICIOUS

PDF

40.1 KB Created: 2020-09-01 20:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef71e7ae81ccd9a65ddb9cab64bb463b SHA-1: 59899c22e126f7bf2bc4c358904d16a342dbbe5c SHA-256: f2a359d8e27d99d61299a1c9345d40301bbe1846977b9f0fe6012441bc1276b9
152 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 `https://ttraff.club/wix?keyword=barclays+application+form+for+jobs`. This URL is presented within the document body, disguised as a job application link. The PDF also contains a link farm, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to obscure the malicious redirector or to appear as a legitimate content aggregator. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=barclays+application+form+for+jobs
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/wopewesefiresikowunagog.pdf
    • https://cdn.shopify.com/s/files/1/0449/6615/0303/files/hybridization_examples_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0435/9651/3448/files/96272120865.pdf
    • https://cdn.shopify.com/s/files/1/0450/3411/1126/files/wileyplus_physics_answers.pdf
    • https://static.usrfiles.com/ugd/b972d5_c4d574ac87384b98ae5021347f521b6f.pdf
    • https://static.usrfiles.com/ugd/91e123_d3b1e99d3f8340739f9cf1d783cd24f3.pdf
    • https://static.usrfiles.com/ugd/685707_c76543b3931047ce9513f10514dde027.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c523a31869c47538eeaff3ab465aa72.pdf
    • https://static.usrfiles.com/ugd/ce77c6_bb96c949eab74ac397e6997c26cdd0ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_a94da9403b274d20aff407ca5f7507fd.pdf
    • https://static.usrfiles.com/ugd/cd79e3_2467f284cf694eab93599f113c6cc213.pdf
    • https://static.usrfiles.com/ugd/b8c837_4180453556b74d8f9be19202241c0252.pdf
    • https://static.usrfiles.com/ugd/b8c837_955a13aea1074fa1b367fd6c49cbe768.pdf
    • https://static.usrfiles.com/ugd/2f7815_e961f5f6ba4f4eec83a2f4d2dc0307a5.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_off00005e57.bin
61d16b6659c172200d426debe01a68fbdaacfb04a7b48c5e5338d96867a666ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E57 5528 bytes
font_01_sfnt_off00007118.bin
0c4568e6931394a2e16c96a43939ba45a2c9bb7bbe5828a2b50b5c68414d562a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7118 10384 bytes