Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a2bf66f1119ab4…

MALICIOUS

PDF

39.3 KB Created: 2020-09-02 09:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b2da0d13926ff6cb34ef3460f4ef8f SHA-1: 90da947b717010f095fcc0d01ef95ec7315eebf1 SHA-256: d5a2bf66f1119ab4422ca6bc3be9ad8e91fa8a5a23d83d6bbdf026ae8e46f0b4
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering through a deceptive link.

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=understanding+shyness+psychological+perspectives+pdf
    • https://cdn.shopify.com/s/files/1/0432/3432/8735/files/99708808887.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/xekokanovufutud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/accounting_golden_rules_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/statistical_treatment_of_data_formula.pdf
    • https://static.usrfiles.com/ugd/2ddd39_33a20980cddb4171824062bfd44cde71.pdf
    • https://static.usrfiles.com/ugd/3cb679_22f62e527d5e4fc58e5602b835d23de9.pdf
    • https://cdn.shopify.com/s/files/1/0450/2539/4838/files/bodabegutavovo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/38366132111.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60359225188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdf
    • https://cdn.shopify.com/s/files/1/0429/7519/9391/files/biology_notes_for_class_12_sindh_board.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/dopijerosawovarojasidiz.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_off00005ba3.bin
06fd0c72647f253106aad7fd10ab6378c6ef7857d45b286f852ab3bb31c5a59e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5572 bytes
font_01_sfnt_off00006ea1.bin
acd5e1e1387a43c300566d4cce10491916eac6f3278212c1f599ad209acb52ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA1 9872 bytes