Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b8c0a7045d86e4…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 01:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d5607d8a776e158054e81fb16d493b5 SHA-1: 9e5021c2146dd0b0eac1e91b2e5c13af28fc4250 SHA-256: 74b8c0a7045d86e47dbe3dc8b28d04a6ec2b9d3a7438a4307a078b627c092181
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO poisoning to drive traffic to malicious sites. One prominent URL, 'https://ttraff.ru/pify?keyword=fortresscraft+evolved+multiplayer+guide', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=fortresscraft+evolved+multiplayer+guide
    • http://files.firstcongcadillac.org/uploads/1/3/1/0/131069886/e89cc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4797/7114/files/wirobepiwevakozixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/jibimawapebet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/68549557781.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/39276401589.pdf
    • https://cdn.shopify.com/s/files/1/0428/7430/6727/files/9483955586.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/kseb_assistant_engineer_rank_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/64247818841.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/production_of_cocoyam_flour.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/34181714609.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3728/files/cheri_cheri_lady_song_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0450/8883/3701/files/mario_vazquez_gallary.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9203/files/matidiwilanerodisi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofexunixepufatomubudabak.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/21850473262.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_off00006784.bin
9c5ed82b413c356c751d4f6e8341c110f6470c8331c6005c30ebea275c64f094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6784 5592 bytes
font_01_sfnt_off00007a86.bin
a043ccabf2be8dfc63692788293a6a173d7f0fd6bd23bc52bca59e00ec2e3728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A86 10060 bytes

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