Malicious PDF — malware analysis report

Static analysis result for SHA-256 637812d0e63f50ab…

MALICIOUS

PDF

41.7 KB Created: 2020-09-06 19:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ab52faca0a2c5ea473940659f814094 SHA-1: 3a0e2955d2d999b9fc13c6753a24f2304b4ffb11 SHA-256: 637812d0e63f50ab28134c65ecec0f3769a29dacd4a6b0291be7637baa1d1805
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with a primary malicious redirector URL, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to product listings and the malicious URL, indicating an attempt to lure users into clicking. The presence of numerous benign-looking PDF links alongside the malicious one is a common tactic to disguise malicious activity.

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.me/wix?keyword=lace+up+chunky+heel+platform+boots
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3663/1452/files/metijaruxanamuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3949/7112/files/nibuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/checkbox_reactive_forms_angular_2.pdf
    • https://cdn.shopify.com/s/files/1/0461/8865/8851/files/bhangra_empire_song_djpunjab.pdf
    • https://static.usrfiles.com/ugd/8b49c6_063504235e8945c8ad29a488010e7cad.pdf
    • https://static.usrfiles.com/ugd/b8c837_f83e8e3d58ce4460a856622d799ad8ff.pdf
    • https://static.usrfiles.com/ugd/99965f_f15c4d6a8b7f4bdbbec4852d4893540d.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3463/files/fuwas.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/cell_structure_and_function.pdf
    • https://static.usrfiles.com/ugd/47b1e8_ba1aa218acd94d719982872d829733d5.pdf
    • https://static.usrfiles.com/ugd/c81504_afb2d47f94ad4773a305a04fe49656bd.pdf
    • https://static.usrfiles.com/ugd/4b874d_25c9a23e3f534deda3a388ddc04a7000.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005df1.bin
64e7f1b6796e2b6e9e0978ae2e3ed46339f47e3b969ba9c9159f0e083c1e5927
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF1 5504 bytes
font_01_sfnt_off0000708d.bin
d91e92bb8cb30ab346863663c60b53d28c0bfc4b896538158bc2982af764a790
pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 13108 bytes