Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41334b66765164…

MALICIOUS

PDF

36.2 KB Created: 2020-08-28 05:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de28eea487b7cd06a3d0932995839aca SHA-1: 5891676f5d6b0f402b2bad9c63fdfc406444abda SHA-256: dc41334b66765164c0da3ac7d4077986d34464f06174d4d7b92ae64beaff6c4c
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.com/pify?keyword=gre+math+workbook'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are to Shopify. The document body, though heavily obfuscated, contains references to 'Gre math workbook' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=gre+math+workbook
    • http://jabasoliv.royalsurreybreastunit.com/uploads/1/3/1/8/131858530/f250bc5ef.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/whirlpool_washer_dryer_combo_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/duxalopubifose.pdf
    • https://cdn.shopify.com/s/files/1/0434/1773/1229/files/shinedown_attention_attention_bonus_tracks.pdf
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/anonymous_and_synonyms.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wiwatubaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0802/3966/files/schindler_s_list_partitura_violin.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/zebubedogituzubumifuduba.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6630/files/paxepulamigopitexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2716/1507/files/82538388136.pdf
    • https://cdn.shopify.com/s/files/1/0433/2617/7438/files/bingo_center_cookie_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/vaxelafogajer.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/javojotafi.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_off00004e0c.bin
5aeb3fe0879bed602fae04380e7d3e0114a4e474f8bc608632d32a0847ac16a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0C 5040 bytes
font_01_sfnt_off00005f25.bin
00fa82f4f022c9c1c9bad355a3c23ef71012809aa36c6ede8763e52a56d3d4cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 10628 bytes