Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c24fdffda4b00ca…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 00:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb7a3927f1c1d967845672335d1db56 SHA-1: 400be808a01646869d7b1574490f794b51b7b889 SHA-256: 1c24fdffda4b00ca24d210c64af0b7baf2716483df4985eee01768d88dfbf451
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.cc/wix?keyword=auto+parts+salt+lake+city'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to Shopify-hosted PDFs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily garbled, contains the same malicious URL, suggesting a lure to external 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.cc/wix?keyword=auto+parts+salt+lake+city
    • https://cdn.shopify.com/s/files/1/0430/4008/0025/files/56920141849.pdf
    • https://cdn.shopify.com/s/files/1/0440/7987/4213/files/wafasabezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1981/files/oil_and_gas_companies_in_uae.pdf
    • https://static.usrfiles.com/ugd/f46427_e60f0c7060d946319b26700023682207.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5da69e4631440b58f7fcf8c8e94b7ee.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_f0b15294fd2a41b391f20d63bd9a3cb4.pdf
    • https://static.usrfiles.com/ugd/1a89c8_f8261b787947428f9a9ab9c833c27144.pdf
    • https://static.usrfiles.com/ugd/b8c837_1de3566b0fd0421b93de172b59c58feb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b100a3be4a034c869ea71974aaa80930.pdf
    • https://static.usrfiles.com/ugd/086daf_3ed3ada706944d13867ba0d6be9d73dd.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_553c3589f1f642b598b7979d326d7d3c.pdf
    • https://static.usrfiles.com/ugd/111c46_c06b5f15c8e74300bd637038b167c8a9.pdf
    • https://static.usrfiles.com/ugd/1b8612_76aa88909e334ed0a02ff92037a419ac.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_off0000630f.bin
7c89d7f71b61005239c2afa76ea230bbc6866df6ec6456f93072af5b8a69204e
pdf-font-stream PDF embedded font (sfnt) at offset 0x630F 5084 bytes
font_01_sfnt_off00007471.bin
a899e76c868f5a07c78a68946ff493a135c5fac6339195011f9eef246c612793
pdf-font-stream PDF embedded font (sfnt) at offset 0x7471 10724 bytes