Malicious PDF — malware analysis report

Static analysis result for SHA-256 208ece043613c444…

MALICIOUS

PDF

52.3 KB Created: 2020-08-31 08:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d60f3b08c69202a41ce923ac3a98a458 SHA-1: 334350b8e0e9f8ff2a1dae002b6e87ce69fdc9ed SHA-256: 208ece043613c44494bef011ca2362726dfe902f3e3ad803d2c6c2a93ff2b2c0
152 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, primarily through its extensive use of external links. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that at least one link points to known malicious redirector infrastructure. Furthermore, the PDF_SEO_LINK_FARM heuristic reveals a large number of links to other PDF files, suggesting an attempt to manipulate search engine results or create a link farm. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this document as malicious. No scripts were extracted, and the document body is largely unreadable binary data, but the link structure is sufficient to infer a malicious intent.

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.ru/wix?keyword=teoria+de+conjuntos+ejercicios+resue
    • https://static.usrfiles.com/ugd/4e6dd5_bcbaabcd60ba4ddcb67eaace7b19aa7b.pdf
    • https://static.usrfiles.com/ugd/89064d_c44541134f734cbb9d4c10422774235f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd40c3fd57164031a5621a046f512770.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/tasemexifoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2769/2695/files/jizinidopobilunubuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/16820472012.pdf
    • https://static.usrfiles.com/ugd/0b46e6_e314196e33b3432eaf6200b804320f3f.pdf
    • https://static.usrfiles.com/ugd/66c878_bd210129cd764e25be5368ed72fdee40.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddf5f9b00c734c4c8da90ac4924426b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd0bdb4ea354122ab036d196f5a9c5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd9dd0d62511484da7117de698f3ab76.pdf
    • https://static.usrfiles.com/ugd/f46427_7a22675b9877492ca6148933c8a8ea89.pdf
    • https://static.usrfiles.com/ugd/3b7182_49c5f89192574a9c87b33b32855e5315.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684a.bin
3dbf60aeab2244212527db05710c8e7bcb3abd78f4941d3b64eff02bee127d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 4928 bytes
font_01_sfnt_off00007912.bin
9da1549bd158e90242203e4b7f11104feecc34b66a013fc145cd2984058f231b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 16404 bytes
font_02_sfnt_off0000aa10.bin
c72404c63d41e80bb5598a63f5f8c35e81d9a249d4fa16d7936b1d0c04c8fe63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA10 17028 bytes

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