Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34e7eb9a6616b26…

MALICIOUS

PDF

48.7 KB Created: 2020-09-01 04:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c9e6b07eca6d9202f9a4f10b155ef1 SHA-1: a226441b0ca759c56809833b070f4586bb2f2366 SHA-256: d34e7eb9a6616b26ce8acc6690216a969228563345812e7642c245affa1d5178
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, masquerading as a strategy guide, to external PDF files. One of these links, https://ttraff.ru/wix?keyword=swords+and+sandals+2+strategy+guide, points to a known malicious redirector. The document body is heavily obfuscated but contains the redirector URL. This suggests a phishing or redirection attack aimed at leading users to malicious content.

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/wix?keyword=swords+and+sandals+2+strategy+guide
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/bacterial_conjunctivitis_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/81753750679.pdf
    • https://cdn.shopify.com/s/files/1/0439/9572/5982/files/89221416855.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/bank_clerk_exam_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2734/8121/files/fukuwovurizozas.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/kinafeneti.pdf
    • https://cdn.shopify.com/s/files/1/0431/3569/7063/files/47109344902.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/nefetebu.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_ad6d5f759db843f7a19bc19410fd491d.pdf
    • https://static.usrfiles.com/ugd/857e61_c1451a9f12d24a548a8e7208bb3a12bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28f30ce82144481a06ca84e8cbf376e.pdf
    • https://static.usrfiles.com/ugd/fac845_b6cea1b3b3124f8c81805a710b477521.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_09a07265b6274ebba5f96f7f73fee7c3.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_off00007871.bin
f64835ba8fe02e4a7a31c1ce344d43ba3d2922442cafa4449fd3a92fa16d5bac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7871 5420 bytes
font_01_sfnt_off00008aff.bin
2dcc89c210882e88dcd08114d40625f168049571c719d3310c4d5d46e476b765
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFF 13420 bytes