Malicious PDF — malware analysis report

Static analysis result for SHA-256 c608b7aee53d9e36…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 16:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 138508ba8bce4f3f693a94b54cc31495 SHA-1: 1145bde2fb7722c166f004acddad834dac035a46 SHA-256: c608b7aee53d9e368b67ad34bc56cfccec718adebf14201019f433a2fa2446b5
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as sheet music, which redirects to a known malicious infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though partially garbled, contains the lure text and the malicious URL. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=iris+goo+goo+dolls+flute+sheet+music
    • http://files.wealthsquats.com/uploads/1/3/1/3/131379671/3779930.pdf
    • http://files.ansurveyinstrument.com/uploads/1/3/0/8/130874567/xenelekenozujopen.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6911/files/soxovobuvosidiron.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/colosseum_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/kigivobaruruxawubefebagut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/adaptation_of_animals_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/bigagexetawof.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/xuvit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8131/0114/files/vaviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/71518194076.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/52648708994.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/ariston_built_in_oven_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2085/2122/files/reasoning_deductive_and_inductive.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/fizejiwaxuwogafarozid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/arithmetic_and_geometric_sequences_crossword.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_off00005a39.bin
2b5983b03d03a8c60f1c75d9c38903e02ae949ddae186cfb4c0616c8aff84d02
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A39 5160 bytes
font_01_sfnt_off00006b98.bin
75d2f33a408960e1703c296d790cb605cf56f8bd9fa37078688daa782a3afc3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 15536 bytes