Malicious PDF — malware analysis report

Static analysis result for SHA-256 8634e8ddd7c7a25a…

MALICIOUS

PDF

37.8 KB Created: 2020-08-18 18:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da96016af20afd43f933805417890053 SHA-1: 5178448040eaeede54484d7c0fa61778a1758fc8 SHA-256: 8634e8ddd7c7a25a32e32c94d389342aa2b2b2e09fa1be2f4684a6dbd0cebce4
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, a technique often used to create link farms for SEO poisoning or to distribute malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves to obscure the ultimate destination of the malicious payload. The document body contains garbled text along with the redirector URL and several Shopify-hosted PDF links, suggesting a lure to a malicious site.

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=seara+asta+facem+show
    • http://lepifojus.kidney4keisha.com/uploads/1/3/1/4/131408791/9099526.pdf
    • http://files.ctslouisstlaurent.com/uploads/1/3/0/7/130740177/kinomopapomiziz.pdf
    • http://api.new4.me/audio/21e230798392476fd5d172c5904f3e3b
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/2._54-_0_11._4_old._firm.pdf
    • https://cdn.shopify.com/s/files/1/0430/9988/1639/files/etrian_odyssey_v_classes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1599/4529/files/astm_a532_class_ii_type_b.pdf
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/raleway_semibold_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/86660870239.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49181926903.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/249388055.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/kupofinipul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/95320984110.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/vowulonetaborege.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000436b.bin
bf08d782f069ea699a06a826e89c237560a7c62e3d1df5163fb88a3af0c3c29e
pdf-font-stream PDF embedded font (sfnt) at offset 0x436B 4920 bytes
font_01_sfnt_off00005425.bin
2cf0b56eda0c156443a125c792b986101fc5d421df5f25835fd7b665940ae008
pdf-font-stream PDF embedded font (sfnt) at offset 0x5425 12036 bytes
font_02_sfnt_off00007b0e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0E 4324 bytes