Malicious PDF — malware analysis report

Static analysis result for SHA-256 4081464650ca3bdf…

MALICIOUS

PDF

42.0 KB Created: 2020-09-05 22:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22b6a5f7d05ae94c177195059801b466 SHA-1: 8f1d03f610bd39084bdd93c24b3b466b1f151680 SHA-256: 4081464650ca3bdf2de6958acc1a9a1636481d8a8454fad02bcd7f892414f985
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link redirecting to a known malicious domain. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for free business card templates. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or social engineering attempt.

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=free+business+card+powerpoint+template
    • https://static.usrfiles.com/ugd/b7082a_e642abe4b4504cf7ad877a639d21ed91.pdf
    • https://static.usrfiles.com/ugd/f08e01_90cb3aee5f8340218133e35308bd4e39.pdf
    • https://static.usrfiles.com/ugd/895bef_611546e3c5524866803cbe5abec40298.pdf
    • https://static.usrfiles.com/ugd/4b874d_6d29f342ebb847fbb94a89955d2b4e03.pdf
    • https://static.usrfiles.com/ugd/ef253e_df1a2cafcefb4f529a55566642c22dd3.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/gospel_of_mark_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7878/files/gajosirawifuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/babutedomiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/48122614787.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/trigonometric_graph_paper.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0599/files/3226873043.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/sat_math_no_calculator_section.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/carnival_of_venice_euphonium_solo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/wanigikada.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/curren_y_the_owners_manual.pdf
    • https://static.usrfiles.com/ugd/efb3f0_2d389825a0ff4b57863b979356a066ee.pdf
    • https://static.usrfiles.com/ugd/902d29_4a60b76c77be4420a48ad702db29d496.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_off000065f4.bin
d73dd48d2e83a63ead4fc2c199844dcd25bfa67007ccaa908f9bd6495a4a7fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F4 5408 bytes
font_01_sfnt_off0000784f.bin
9a08a770c1bfb820c733717600cf220482c7683def3d07c9d92fd7cacc400294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784F 10392 bytes

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