Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef8c2b1b44108da…

MALICIOUS

PDF

42.6 KB Created: 2020-09-03 05:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25a471c5b790e39b37a60774923a0b8 SHA-1: 8cc57ea5b0c107e24dd2226fd268dfeb31f5aece SHA-256: 0ef8c2b1b44108da9bb2215aef95e04048fa66b43659f8d409f73fb26c1a51c3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=online+advertising+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'online advertising pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=online+advertising+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1750/1853/files/counterintelligence_awareness_and_reporting_brief.pdf
    • https://cdn.shopify.com/s/files/1/0454/2994/8572/files/lipid_lowering_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/wedilagokarozigitajafiruj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/alif_novel_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_14adb31cc52b42c2910f88d46b30196b.pdf
    • https://static.usrfiles.com/ugd/6d59ab_5e8b4e9998af493988a5c0b053478840.pdf
    • https://static.usrfiles.com/ugd/f523c3_f9e97a9f3d914f09ad65d6e4c5a6372b.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_6719c76122fb478098674294070fe426.pdf
    • https://cdn.shopify.com/s/files/1/0465/0188/8168/files/intro_logo_template_after_effects.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/49590007138.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/3339892969.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7423/files/93818982471.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_off000067d5.bin
ad1209dabb64d991ffe90712429cc2a71619b94396fa887d406c371b3c188fa8
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 5296 bytes
font_01_sfnt_off000079ee.bin
f64fea16e5d657bd7cc8762ead2eed55ded7a15442efd3697a59b8b243336654
pdf-font-stream PDF embedded font (sfnt) at offset 0x79EE 10640 bytes