Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbab13994a626a9…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 04:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2622abe6f0ad84d9a74b11d4ac290d60 SHA-1: d34029e4900917ec13c050196eaa72ab0bded263 SHA-256: 3cbab13994a626a9d454b3d069a4161bb73cf662f79390ffad05f4f3fa1bdf91
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to distribute malicious content. One of the URLs, 'https://ttraff.cc/wix?keyword=heads+up+baseball+2.0', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and a benign-looking Shopify URL, suggesting a lure to external 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/wix?keyword=heads+up+baseball+2.0
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/dogitasevilube.pdf
    • https://cdn.shopify.com/s/files/1/0433/2489/9496/files/laberintos_dificiles_para_imprimir_g.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/cost_accounting_past_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/acid_alkaline_food_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/4820893272.pdf
    • https://static.usrfiles.com/ugd/b8c837_712e1fddd27c4c2fa7f0ad69cefec446.pdf
    • https://static.usrfiles.com/ugd/b8c837_54a2691d9d394dd08f3885814c2e06d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a89813248842adba99f71001887dc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3f0db402aa4661add6d593c1d3be1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f497ba781d34cb5a5cacf40d1b91d67.pdf
    • https://static.usrfiles.com/ugd/b8c837_52ec838016c447a4950c447996aae5ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_02b4302d4f1043058007fd589118c5d8.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_off00006c67.bin
822e45e48be27d03a8f0d7b275e082e5e982d9b4e1c896092f085b7af2b230d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C67 5264 bytes
font_01_sfnt_off00007e4e.bin
613839ac8c6791a493e9b5809c64ba4cab136988cb87dc2f49927a91a042abc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 10424 bytes