Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4e81966ae83724…

MALICIOUS

PDF

39.9 KB Created: 2020-08-29 04:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c723075ca95681040c518ec8a58a7fc7 SHA-1: 8d7ac224cefcfd9c4bbba65f6ee4af6ee5add9ff SHA-256: dd4e81966ae83724e32831f819ce792ce547c320eb9e72388338cfb8c8425ee9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the ML classifier's high confidence score. The document body, though partially corrupted, contains the same malicious URL. The presence of a large number of external links, many pointing to static.usrfiles.com, suggests a link farm designed to obscure the ultimate destination or to appear as legitimate content. The primary malicious IOC is the redirector URL.

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.link/wix?keyword=old+man+logan+cbr+espa%25C3%25B1ol+descargar
    • https://static.usrfiles.com/ugd/b8c837_38e3b4eab8184bb18eb1994d489493f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7ab4f29fb2a47d6b67267b97015b512.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cd07d6a290341e78b8e927004c7b71b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9b326143fe24e86aca53f7e7acfd20c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d82d46828234bcc8de5d7a7848bcd02.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/48437791530.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/11779219305.pdf
    • https://cdn.shopify.com/s/files/1/0433/7981/8661/files/luzidijeluxawumaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/keto_meal_plan_for_weight_loss.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/kizurun.pdf
    • https://static.usrfiles.com/ugd/b8c837_e31d2145ce634a5995cfab1fcd8bc3e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_10972bc023f3423fa877927d8c2d2a12.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d60dd316c6241669db5fe2968fe1e13.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5708ec81aa04e80abf8143ce2ac87a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_771c7bb782ae4ffabacd897664d6389f.pdf
    • https://static.usrfiles.com/ugd/b8c837_48dfbe299e9a4f2b8cf9536bfa38540c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c762cac771034d9f9681d8e751bb0e0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_720f27dbbeea4f4584d63ef9ccc4cf04.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_off00005984.bin
a1ac65df48fd35a57f2fde67c6db320ffffdf87a82db9fcae22c9bc8e9eb87b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5984 5772 bytes
font_01_sfnt_off00006cbf.bin
f5ef6d9ce271bf473e40f65e960371ddf15ab6117380c960d66cd56a426d7c68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBF 10492 bytes

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