Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4d3425d3a54cb3…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 10:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2515a15f3c687a067eef62a0edc03b2b SHA-1: 2c37cb8bba384de07889ccd3db48fa47506e3f3c SHA-256: 4b4d3425d3a54cb3887a1ce52a222d8c74181434cdef849c1be4ab0578073214
154 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=causes+of+air+pollution+in+nigeria+pdf'. This indicates the document is designed to lure users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, further supports the attack pattern of a link farm. No scripts were extracted from this sample.

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/pify?keyword=causes+of+air+pollution+in+nigeria+pdf
    • http://files.familiesrforever.com/uploads/1/3/0/9/130970003/c45908bf.pdf
    • http://gagufarog.boatandhobbies.com/uploads/1/3/1/0/131069839/db968.pdf
    • http://magol.philanthropyexchange.net/uploads/1/3/1/6/131606636/vikebidavajarebise.pdf
    • http://files.coronadopace.org/uploads/1/3/0/8/130814118/8476350.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/18534451914.pdf
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/seruvepizowib.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/sosefubitokadibizagume.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0520/files/calculus_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/89653840597.pdf
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/49935619521.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/27034751429.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/99833404501.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/digovasafaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/wondershare_password_remover.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2823/files/shabba_ranks_a_ap_ferg.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/romijaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/falutomukufudunimuxon.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_off00006946.bin
120f5c9e2e8b6f872445575c4ef49035389a5173e527550eee78b1934751b476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6946 5112 bytes
font_01_sfnt_off00007ab6.bin
d574e19422d47edc0b93ba30e226b86cdb93b9149b61e5dec089c7f6ae35185d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 10272 bytes

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