Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d827358a413118…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 19:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b5129a125d3da90c6efd818da5e884 SHA-1: e9e4ebd6c7a02c6cd37502360e45ceb220bd250f SHA-256: f4d827358a41311881129644f1b9075e23c4718a980512dccc7f496180822dc9
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to `https://ttraff.ru/wix?keyword=como+hacer+un+recetario+en+word`. The document body, though partially obfuscated, suggests a lure related to creating a recipe book in Word. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links further supports a malicious intent to redirect users.

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/wix?keyword=como+hacer+un+recetario+en+word
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/40484954898.pdf
    • https://cdn.shopify.com/s/files/1/0432/3934/2247/files/pegetumawuzevax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/gender_pay_gap_reporting_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/milestone_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7197/files/reading_comprehension_upper_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/vonowizi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9138/4736/files/66169946578.pdf
    • https://cdn.shopify.com/s/files/1/0435/7059/3955/files/writing_a_comprehensive_report_in_special_education.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e5a193d5a88492992265c7423176a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0b1f739eb242aa9231e83263d6eb70.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ebb2b9cc4f49bcb732a2ef894610f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_189ad59eae1f4411ac9b7abda0c0600d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d15b243ac0b94e89b68fc01888e4e9ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd30a3165401484da617c59abe85d728.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e7b438a15d4094861e66aa57458834.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/
    • https://static.usrfiles.com/ugd/b8c837_189ad59eae1f4411ac9b7abda0c0600d

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b16.bin
58c50ad481f71194c52fdec739042eb7cb4351ff8a128d7f85fda6cd73083380
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 4968 bytes
font_01_sfnt_off00007bdd.bin
ad0de36ae2b5c3e22576eb5c1a33e01208894af2f94c83f34971f59b4e420527
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDD 12040 bytes