Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cdc792a617cc93…

MALICIOUS

PDF

43.3 KB Created: 2020-09-06 10:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ab587d1583987d29f1864267fdb0dab SHA-1: a17209105680459fb12a3d3f57b1f19df5da1d9a SHA-256: 25cdc792a617cc93209dedf769b6097dfb040ec5598948501fdaf35d8728a180
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links. One critical heuristic identified a link to a known malicious redirector, and another identified a link farm. The document body contains the URL 'https://ttraff.me/wix?keyword=guide+to+iceland+book' which is likely used to lure users to malicious content. The numerous links to external PDFs suggest an attempt to manipulate search engine results or distribute further 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.me/wix?keyword=guide+to+iceland+book
    • https://static.usrfiles.com/ugd/db93e9_887638057baf41389a3695060a167c58.pdf
    • https://static.usrfiles.com/ugd/3a38e0_c6ac2d80e544411b9342ce7002aee5d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0ad4987847744cd9d878a83d8b35a12.pdf
    • https://static.usrfiles.com/ugd/d1c05f_03d1a624f5fe4c7d9bef702e575180fc.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8954/files/zalonesotewapujikuji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/48594554697.pdf
    • https://cdn.shopify.com/s/files/1/0436/5336/5910/files/34590650747.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/96687973212.pdf
    • https://cdn.shopify.com/s/files/1/0433/9538/3461/files/29150194624.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/85356940779.pdf
    • https://cdn.shopify.com/s/files/1/0465/7849/9751/files/possessive_adjective_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0454/7431/6454/files/oneshot_niko_gender.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9799/files/foredodezipupesemepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/mammogram_screening_guidelines_age.pdf
    • https://static.usrfiles.com/ugd/9d66c7_a6166e621ec94496a2e7a29a93f0115e.pdf
    • https://static.usrfiles.com/ugd/efb3f0_0992d08cb2fc424c8d7fda69783a63c1.pdf
    • https://static.usrfiles.com/ugd/c722c2_4ba0d2c31c7e4cf3bf6e33e483037013.pdf
    • https://static.usrfiles.com/ugd/c5d40f_bd7e50f15e214a85942055f07285f60c.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_off00006be0.bin
f759b0b8aa12638aaadc32c25fc1a802e529c02d69d2ec6f949685f7072094ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE0 4896 bytes
font_01_sfnt_off00007c9f.bin
aa23aa848c0ceefe04f3900194a63f7093d5e9a232a42df96413d3bc73ac6a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9F 10412 bytes

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