Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b1bc7a95d57e17…

MALICIOUS

PDF

39.6 KB Created: 2020-09-01 09:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f230ec048f644446467f61a7e97bfcb4 SHA-1: 56f0e137377645629fb6ac7cbaf3f9a7c99fbf53 SHA-256: 97b1bc7a95d57e174fe60908bdd9b42b213ad89119c474fc2ab7fdabd517e76e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=iphone+headphones+android+adapter'. This URL is embedded within the document body, suggesting a phishing or scam attempt to lure users to a malicious site. The presence of numerous other links, many pointing to benign Shopify URLs, indicates a link farm SEO tactic to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=iphone+headphones+android+adapter
    • https://static.usrfiles.com/ugd/b8c837_5360837f048243f5b64ed894b6c65273.pdf
    • https://static.usrfiles.com/ugd/15cd4d_718b88711cc84d1598c421124c8e73dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f50a5e426af48a5a32e29de52799ca1.pdf
    • https://static.usrfiles.com/ugd/eaf48f_92223b8a1d3044b698ac676e93999eb7.pdf
    • https://cdn.shopify.com/s/files/1/0435/5774/8897/files/5194038496.pdf
    • https://cdn.shopify.com/s/files/1/0433/7339/6133/files/militifarajom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/2789424146.pdf
    • https://cdn.shopify.com/s/files/1/0437/4105/3080/files/riwegajopugixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/17874848073.pdf
    • https://cdn.shopify.com/s/files/1/0432/0372/3428/files/movezonawobiluba.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/agilent_7890a_gc_software_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7048/7712/files/antecedentes_del_aprendizaje_significativo.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_off00005d13.bin
0b23ae401ca89ea1aa22845bb7e5c82faaf5c50f8dc3e70c355ae1f013e73dba
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 4952 bytes
font_01_sfnt_off00006de0.bin
64bb05d4ead7761d7cd08540193898d03427c4fbb4174b3335d368c58efce734
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 10580 bytes