Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f4e3f8abef9067…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d07d2e5d8640df7303853a931bda2a6 SHA-1: 2313da0de4c60ea71677cd6de845c516cff63798 SHA-256: 81f4e3f8abef90671c5307d211caf7eabf3171e812a1692f74b30aad7851b2b3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though partially corrupted, includes the same URL and a keyword suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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/pify?keyword=weather+report+today+mardan
    • http://files.lazyacrescampground.net/uploads/1/3/0/7/130775195/7284154.pdf
    • http://kiter.acpamint.com/uploads/1/3/0/7/130739220/7830316.pdf
    • http://files.wseast1984.com/uploads/1/3/0/9/130969334/28052.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/bobakirinonoga.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/assignment_of_contract_california_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/wisadusuguwudimosopeje.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/minecraft_command_block_id.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5397/files/important_national_and_international_days_and_dates.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/1219908908.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/baahubali_movie_full_hd.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/famunilojudasimimodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/tamil_audio_song_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/elements_of_photogrammetry_with_application_in_gis_fourth_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c3.bin
49aca2e0511c18f747002fb1bad28f1f840cc6977915ac0c7ae4350bb564270c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C3 4844 bytes
font_01_sfnt_off0000621b.bin
5192466a73ed5332c44a58ee7631c143d95ab03cc492a0ac4cddc1dc9c029d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 10104 bytes
font_02_sfnt_off000084bb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BB 4324 bytes

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