Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f7fd172abfae1…

MALICIOUS

PDF

45.2 KB Created: 2020-08-11 05:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecee49d108666a14baa6fae9b3c3cbc8 SHA-1: cb48389616591908f3960d45968ce2e43e7dc51e SHA-256: b79f7fd172abfae1ad96123af00b7915d0f3bf8ab3c8d5e63e10483f3a083c1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm technique to improve search engine ranking and lure unsuspecting users. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=paulo+koeljo+alef+pdf
    • http://files.getbodyfood.com/uploads/1/3/0/7/130740049/najebijele_velufinusepewal.pdf
    • http://files.captivatinmickey.com/uploads/1/3/1/3/131398246/2085000.pdf
    • http://guwuwugo.techmusings.me/uploads/1/3/1/3/131383648/xalisaneduwokum.pdf
    • http://files.deborahkellerrihn.com/uploads/1/3/1/4/131453177/9edfee3bb0096.pdf
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/67560062575.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/wusobusasamojive.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/detadedo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/capital_cities_of_the_world_list.pdf
    • https://cdn.shopify.com/s/files/1/0440/9357/1224/files/clayton_antitrust_act_of_1914.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/dejejipugirokejifividura.pdf
    • https://cdn.shopify.com/s/files/1/0435/2311/3119/files/koxaluzotenuluk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/34793801637.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/67875895852.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/modijukoxuvazedezatuxo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ac.bin
478f68f2ce277bfb28689e76d551540f7abb52831a8f9f43d924f9975e2e1290
pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 4900 bytes
font_01_sfnt_off0000857c.bin
25d0e2164845ce34e372e18df93e6115e46090e71780564e5bb18ab77d9488a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 10156 bytes