Malicious PDF — malware analysis report

Static analysis result for SHA-256 1824848b989a7679…

MALICIOUS

PDF

41.8 KB Created: 2020-09-01 12:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df07938e97061267697c5ebb0220fc55 SHA-1: 4ee8808673a2cf477a6d98b384c8c9fab1eacda9 SHA-256: 1824848b989a7679e2f37e974dca1b896180962ef9b3baeb8d09b7d2c8ef18b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a PDF redirector link pointing to 'ttraff.club'. Another critical heuristic indicates a PDF link farm, with one of the first URLs being a Shopify link. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious redirector URL and several Shopify URLs.

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.club/pify?keyword=commercial+iron+press+for+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/bombastic_words_dictionary_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/38490101006.pdf
    • https://cdn.shopify.com/s/files/1/0429/5213/0716/files/xunozejonakenorisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2755/2661/files/aadhaar_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1429/files/sabamidoneforomoriju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/punuxudorabaz.pdf
    • https://static.usrfiles.com/ugd/c6ac46_6fbb09f9f6d440a0b43085a2b1cb6b93.pdf
    • https://static.usrfiles.com/ugd/de3d83_3c2c170219764e2cb6428593156e2df7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/couldn_t_modify_partition_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/wisolonobunazomotetozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/31512624791.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_off000066fa.bin
5d6a99cb003c931c5d38d6086f0eab6d39b73eb8b94c7b9c80e3ba35ba111dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 5160 bytes
font_01_sfnt_off00007853.bin
642230fe0b13a2afdd3ba267e8d8ce9938ed56d25f67c4ed352207784acf734b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7853 9904 bytes