Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dd7f49905ac33b…

MALICIOUS

PDF

35.4 KB Created: 2020-08-29 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a30cf65be908bd2790e5bcb3c948618 SHA-1: 87838414eda159cdd31d4d5f452a56f4e1ae8d61 SHA-256: d1dd7f49905ac33bd580d788e5bd3437e53d06f6c573de4f91b35068b0fea803
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The primary link, https://ttraff.com/wix?keyword=advanced+financial+accounting+10th+edition, is flagged as a malicious redirector. Additionally, a large number of other PDF links are present, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=advanced+financial+accounting+10th+edition
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/81935287533.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/toveka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/7118020669.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/96631504637.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/31774950703.pdf
    • https://cdn.shopify.com/s/files/1/0433/9132/0229/files/defensive_driving_course_nj_test_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_05993c81144f4aa2b98467f1fba49b0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a416cad38184da183d0e9c57440a2ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e670042cac344c49b87044d1014db7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/6255169554.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/functional_analysis_balmohan_vishnu_limaye.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_off00004c21.bin
e1ac75b52ca6c054419b99af601afde92f030514676c4d87447a709cd6a77447
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C21 5252 bytes
font_01_sfnt_off00005e04.bin
edc629872ca10b4f9e816a92ccf667f47eb8b9f6ac8c2b1812f29e76f7abd358
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E04 9728 bytes