Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c57c4fb8b679bb9…

MALICIOUS

PDF

65.1 KB Created: 2020-08-25 03:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 062f9add56d0911bc4bb70dac275fb26 SHA-1: 9e21860897053404d03554de24ff8087766d59b1 SHA-256: 5c57c4fb8b679bb9ac0a92aa2b65b69c31561e13f08812b2d8cece874942ae2f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious content. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to increase visibility. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution lure.

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=poe+delve+build+guide
    • http://files.emmazang.net/uploads/1/3/1/3/131398193/nidawozi_kafubarom_muxoxeponazo.pdf
    • http://mixolafa.amusedowl.com/uploads/1/3/1/4/131438437/zamevireniwamog.pdf
    • http://files.wte.co.nz/uploads/1/3/1/4/131406715/gulorutobox-pakatelolu.pdf
    • http://files.berefresh.com/uploads/1/3/0/8/130814132/sikimasinotoxap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1809/0653/files/58866617590.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9673/files/boyarsky_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/24868329455.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/transformers_1_bumblebee_vs_brawl.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/45432078708.pdf
    • https://cdn.shopify.com/s/files/1/0428/9966/9151/files/aviva_life_insurance_s.pdf
    • https://cdn.shopify.com/s/files/1/0457/4599/5932/files/11076918505.pdf
    • https://cdn.shopify.com/s/files/1/0429/2037/8524/files/taco_bell_chicken_chalupa_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/billian_billian_guri_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0430/8064/6807/files/21901322323.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_off0000b7fe.bin
b779bf3c89c5e5e1e71d1e5a43a6487bfc052f578b9624712bcafe0885c40ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 4708 bytes
font_01_sfnt_off0000c81b.bin
d582e0a4e24b0563907eabd98c7caf314f5132aea3e7a3025aa51a6f4edc0e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 2196 bytes
font_02_sfnt_off0000d262.bin
c193a30ff51d22e24b2ba6d7f7325c42016c46e50cf4e893deb35b0facb4be35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 10668 bytes

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