Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da8fc551cbefac5…

MALICIOUS

PDF

45.8 KB Created: 2020-09-01 04:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7996a36e82fe16de33dc5fe31051e23 SHA-1: 882b59f1a3e54147a32ad98fd747867f66c2622e SHA-256: 7da8fc551cbefac5a6b88a2d13c5e4a8f379afde9ae3e21bfdd15a3f91ce8699
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents. The primary malicious URL identified is https://ttraff.cc/pify?keyword=divinity+os+2+class+guide, which is likely used to direct users to a phishing or malware 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=divinity+os+2+class+guide
    • https://cdn.shopify.com/s/files/1/0431/1033/4620/files/26713639690.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/1907397820.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/26184482141.pdf
    • https://static.usrfiles.com/ugd/fa6f14_3670c68cc08e4a3d98e6e1878fc0b17b.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_b616dd5b928b4817a32743edb2dcbf19.pdf
    • https://static.usrfiles.com/ugd/b5472a_226ecb5413434605a0f7fc2627846d4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_506ecb35fdbd4189b8bc2a72fbc73606.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a1f6474fed54c249223072402c99dc0.pdf
    • https://static.usrfiles.com/ugd/5ecadc_34591123bb994c9dab226aa60b9bafad.pdf
    • https://static.usrfiles.com/ugd/0f1814_1e70d3d5433c43b59ce8b638a95f5553.pdf
    • https://cdn.shopify.com/s/files/1/0428/4193/1942/files/audiometria_clinica_portman.pdf
    • https://cdn.shopify.com/s/files/1/0462/2893/0711/files/34412933157.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/76865637558.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/metezonedazopure.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_off00007558.bin
0bf25720340435a22424942cca756d1617e7324e430f3cf93f827d721b293299
pdf-font-stream PDF embedded font (sfnt) at offset 0x7558 5304 bytes
font_01_sfnt_off00008793.bin
86f868d392c9b3d5db145ef182d6311397ff0f7224015e119448aef0b15c91eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8793 10256 bytes