Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a95b4422610108…

MALICIOUS

PDF

41.4 KB Created: 2020-08-31 03:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e37ac6e4570185503a25791caab5ae47 SHA-1: 12eaeb83e611a7d36d4547458a2b0aaa7b817a2e SHA-256: f2a95b442261010802721b28cd1e7fec4af489c0b966c4d9c940f674499b1865
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=1984+signet+classics+pdf'. This URL is likely intended to trick the user into downloading a malicious file or visiting a phishing site. The document body also contains this URL, reinforcing the attack vector. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious 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.com/wix?keyword=1984+signet+classics+pdf
    • https://static.usrfiles.com/ugd/d2751c_916217b6a9724fe88e00e45113682009.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7543a49c0ef427ab294ad4b80b9a20b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1ccccb3e0484a8fbc947a367d1542cd.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/vojowugebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/11160339829.pdf
    • https://cdn.shopify.com/s/files/1/0435/1954/1416/files/long_division_of_polynomials_worksheet.pdf
    • https://static.usrfiles.com/ugd/65b209_b538a8639bac4f79bc2195e1cebcd99a.pdf
    • https://static.usrfiles.com/ugd/37428b_c77be993a8c14fa89d0c83c7c571547d.pdf
    • https://static.usrfiles.com/ugd/b8c837_828c7b6b1e374f26b03c6deba4942538.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2763/files/synopsys_design_compiler_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/418612829.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/11003435720.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/39495897713.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/81357424478.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_off00006401.bin
24d06edbd1cad3d2b6bbc1339faeb0e9d73781dec1a3f26012692fe37e0a7d46
pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 5620 bytes
font_01_sfnt_off0000773b.bin
81cb0f8fc63aa7ba5bab9db6fce0e2d225060ce4bfb3e15fb970e7c77b58bdc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x773B 9956 bytes