Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f86e22f5b17ce1…

MALICIOUS

PDF

48.8 KB Created: 2020-09-04 17:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc580b670cc3148a7c6b5bdde2c0ef54 SHA-1: 34811491d80bdd8294e07860e1080e98b5d04af8 SHA-256: a3f86e22f5b17ce103e5d2f0d4f67d7cff04f50533b7a4b419408fdf91e6d29d
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.me/wix?keyword=steelheart+angel+eyes+song'. This URL is likely part of a phishing or malware distribution chain. The document also contains a large number of embedded links to Shopify, many of which are likely part of a link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. 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.me/wix?keyword=steelheart+angel+eyes+song
    • https://cdn.shopify.com/s/files/1/0437/8106/2805/files/2791545155.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/scratchjr_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/kubobizumabetozu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/lelabixoxobari.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/vaxamezivaritokidewudif.pdf
    • https://cdn.shopify.com/s/files/1/0447/8589/3542/files/accounting_term_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7577/files/guardrails_andy_stanley.pdf
    • https://cdn.shopify.com/s/files/1/0464/6597/4424/files/shell_scripting_interview_questions_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/dragon_nikana_build.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6785/files/32605537887.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5432/files/40897374397.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/89697142796.pdf
    • https://cdn.shopify.com/s/files/1/0469/0634/3584/files/flight_simulator_apk_full.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/94799460678.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/9998243935.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_off00007fa6.bin
99052487c9fc9ea70328d6180502c4253cd9cba7db67af15526df607fdb30e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA6 5152 bytes
font_01_sfnt_off00009129.bin
e9977aade63249d93e3d29b1a0fb3457454739814fefbe6b3bb74a5932b7092a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9129 11520 bytes