Malicious PDF — malware analysis report

Static analysis result for SHA-256 f669a7ab2a57eef0…

MALICIOUS

PDF

48.0 KB Created: 2020-08-11 18:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f46d5149c0d35db20c05dc0942442d8 SHA-1: d994e122db9e981e5a962bef84bc9107025cc670 SHA-256: f669a7ab2a57eef00cc7402acb960e42e1c5112005b2d63d6802f86f9e4a86b2
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, with many links pointing to benign Shopify URLs but also including suspicious domains. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on a malicious link within the document, which then redirects to a harmful destination.

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=pruebas+filtradas+ser+bachiller+2020+pdf
    • http://bobologun.vvvelo.com/uploads/1/3/1/0/131070711/7aae0.pdf
    • http://nafesufek.idealadvisoryservices.com/uploads/1/3/1/4/131437812/9d637f3280.pdf
    • http://files.slyxiong.com/uploads/1/3/0/8/130813447/bubopazedixefap.pdf
    • https://cdn.shopify.com/s/files/1/0432/6388/5472/files/ernst_cassirer_an_essay_on_man.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/22305935824.pdf
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/arco_asvab_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/free_bullzip_printer.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/56866509961.pdf
    • https://cdn.shopify.com/s/files/1/0432/5985/5012/files/duvokaxibijevijesegezutog.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/vugoli.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/jitukomolasivusasararogij.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/zikej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/tebisibobakuxegurugisomux.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/moxetawezat.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/72018920669.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_off00006647.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6647 6744 bytes
font_01_sfnt_off0000772e.bin
58f92b83287deb9dd754f774a63f9a19ac5f623bf7d53a2d0952b39ca74b14b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 5660 bytes
font_02_sfnt_off00008a4c.bin
78dafc8c353454808e548dd6e515f2e0ba64da2fa41c6bfd75cc01aab643148d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4C 11992 bytes

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