Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae8e3cd7a14dd6e…

MALICIOUS

PDF

35.0 KB Created: 2020-08-02 19:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f656056eec2ec7818e95bcfb19502b68 SHA-1: ded93937d2b33fb0b6e0b2a511db6493c4e1f096 SHA-256: 6ae8e3cd7a14dd6ebe116b28ced50dbf2b59bc7f7ee30eda17976fbbdee2a872
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as a gateway to further malicious sites or payloads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and link farm structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=rusty+sword+osrs
    • http://files.newlifestylesnepelenaferraretto.com/uploads/1/3/0/7/130775856/pised-vobep-zinuret.pdf
    • http://files.timberkreekcarving.com/uploads/1/3/0/8/130874595/ab19b9902.pdf
    • http://files.enjoyourlife.net/uploads/1/3/1/4/131437953/lonoj_buxizigosux.pdf
    • http://files.shauneb.co.uk/uploads/1/3/1/4/131454692/jewironavidi-suxufubarano-xipireber-fobuzubumevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/25253043641.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/rubixoxelorawusibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/gaxatolimesawapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0822/8508/files/31604847007.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/dodubadedojapiviboxizuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/41286139939.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/jatufedarutej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/perarotoxejabifabexaj.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_off00004bd9.bin
c7a9a764f31b8210587b69cd028ebc9379ebb1a83f0b777942bb2364fea4d945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BD9 4776 bytes
font_01_sfnt_off00005c3f.bin
f8258426ed3c760894490c25b52375279ae1454a11a3dae8e1c8bd45527e5c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3F 10304 bytes

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