Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e26996756d1cb7…

MALICIOUS

PDF

38.9 KB Created: 2020-08-27 22:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3011c2f84a843dd34161ce17797e7367 SHA-1: 49680ef1e0cfacfb3809d00277bbf89109a1246d SHA-256: 24e26996756d1cb708194fe07f3581f68a9447e7b9e9b8770d7a06ba0f91449e
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One of these URLs, https://ttraff.ru/pify?keyword=champion+swamp+cooler+manual, is identified as a known malicious redirector. The presence of a large number of external links, many hosted on Shopify, suggests an attempt to artificially inflate search engine rankings or distribute malicious content through a seemingly benign document.

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=champion+swamp+cooler+manual
    • http://takumuz.gracefield.net/uploads/1/3/1/6/131606875/nixikibudux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/pdf_to_word_converter_editable_mode_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/56131482565.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/17598273772.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/piano_blues.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/bulk_sms_sender_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/zasepatosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/20919911460.pdf
    • https://cdn.shopify.com/s/files/1/0428/2528/5791/files/41406087125.pdf
    • https://cdn.shopify.com/s/files/1/0441/0084/5720/files/dixakoxaxigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/numeros_romanos_del_500_al_1000.pdf
    • https://cdn.shopify.com/s/files/1/0437/8551/9261/files/chapter_1_introduction_to_chemistry_packet_answers.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/
    • https://cdn.shopify.com/s/files/1/0437/8551/9261/files/chapter_1_introduction_to_chemist

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b62.bin
3ba84e7eb497246dca3125d7c11c2fd31b8b2eed637bd3beefdb93ce91682aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B62 5172 bytes
font_01_sfnt_off00006cd9.bin
c836ae22526c511950cc2add2a06c7d56642bd4402b84fe5c4e0fc55710698de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD9 9984 bytes