Malicious PDF — malware analysis report

Static analysis result for SHA-256 7231d846fed2d4f0…

MALICIOUS

PDF

64.6 KB Created: 2020-08-06 20:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a0615efa0eea4c1216d99749b20f074 SHA-1: 47a094e712428a084e7746cfe136e3413ba8801d SHA-256: 7231d846fed2d4f06770ceb78f6032fb139c8f03dd45909725f4addcb7307dba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=les+apocryphe+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=les+apocryphe+pdf
    • http://zuwogof.digitaltogrow.com/uploads/1/3/1/0/131070792/357968.pdf
    • http://files.afcphilippines.com/uploads/1/3/1/4/131482975/9802301.pdf
    • http://files.musetechnolgies-unite2.com/uploads/1/3/0/7/130776277/xosapidutubakikifi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/fozuruxufajul.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/83862812139.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/38558184636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/zuwasiromaxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/pigukuwi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7860/5218/files/star_fox_assault_iso.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/82098531047.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/hip_hop_dance_move_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/43022807448.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_off0000adb7.bin
e2ae33ced46c9a8d0562375edaec178fe4f8c27e68ea06e6aa66c1d2ed8b7f45
pdf-font-stream PDF embedded font (sfnt) at offset 0xADB7 4808 bytes
font_01_sfnt_off0000be24.bin
0f21ebdb568bddc23c03a96a085837b8948c4e123c1cfd018fb53e730517ae3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 12892 bytes
font_02_sfnt_off0000e619.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 4324 bytes