Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e667e5fa05bbd6…

MALICIOUS

PDF

48.2 KB Created: 2020-08-23 01:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32b97ffa785c94147824de132f40dd38 SHA-1: 0ba9139ce32b262bb2b8cd43bc0a08639a248f03 SHA-256: 13e667e5fa05bbd6bbf9d17f5af2da722cc1e4b4eaadcf89bb46c97de229318d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=german+nationalities+worksheet`. The document body, though heavily obfuscated, suggests a lure related to a 'German nationalities worksheet'. The presence of a large number of 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 social engineering via deceptive links.

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/pify?keyword=german+nationalities+worksheet
    • http://files.nickcutroneo.com/uploads/1/3/2/6/132696414/2638616.pdf
    • http://files.jarettfajardo.com/uploads/1/3/1/4/131407918/2125320.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0451/2625/4745/files/livestock_management_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/birmingham_train_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/rikowipusixexitedaloga.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/91250398325.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/37397901042.pdf
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/the_breaker_season_3.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/wapiriwotalomepivisuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/a_modest_proposal_questions_for_discussion_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/cambridge_international_dictionary_of_idioms_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7551/8107/files/14014803227.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/34505296485.pdf
    • https://cdn.shopify.com/s/files/1/0436/9825/8088/files/nonojofedinitifomodib.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_off0000723a.bin
59f8ff7747ea270afce4858d3782892e6190ec17bb4c6ef5fad10b046e55fca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 4900 bytes
font_01_sfnt_off000082b8.bin
ca7289e93afcba95fcd450b59bf9fad23fe6cc11fa0a5116681e5a9ca2091e01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 10376 bytes
font_02_sfnt_off0000a605.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA605 4324 bytes

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