Malicious PDF — malware analysis report

Static analysis result for SHA-256 0496494434aef171…

MALICIOUS

PDF

36.6 KB Created: 2020-08-30 09:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7bf84ba06d635d418ef677d57426ef8 SHA-1: cb74eb1bee9bd196926a2cc99bdbfeda9750e39b SHA-256: 0496494434aef1716e5718f9e90ffdc4075dd096baf3373c425cd2e3b6f59a39
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits a PDF link farm behavior, embedding 12 external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to online content. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest an attempt to lead the user to 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.ru/wix?keyword=elena+undone+online+subtitrat+in+rom
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3111/6448/files/acidosis_tubular_renal_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/18291760038.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/nodinif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0228/files/sweater_weather_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/new_headway_english_course._beginner._teacher_s_book.pdf
    • https://static.usrfiles.com/ugd/5ecadc_51aa337b9f524951bd919e7a28c58a4a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/best_free_small_reader.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/cestoda_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/dunazugediju.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5788/files/39876228556.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/yellow_rice_nutrition_information.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_off000050b0.bin
24715509bf63d02fd5e2c3f4346d5b108647043c8e0ffb3ff7c051c2ec8ee97b
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B0 5068 bytes
font_01_sfnt_off000061d1.bin
95c1dbcffd194e4c06f648fc4126165f2826cc0f5e49e430abdd85f1dfcc111b
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D1 10444 bytes