Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ea8f2b5c121dde…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 12:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7342194d7749eeaa1915c921bf10e374 SHA-1: 99f63431aa77d569bf546481308affd301411340 SHA-256: 10ea8f2b5c121ddea9d9c366708007e9ddadc12e18d019a08d22b247cc6c51d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary purpose is to lead users to malicious content or phishing sites.

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=background+music++free+instrumental
    • http://files.beeffoundation.org/uploads/1/3/1/3/131398526/kukimogole_kajazotikoj.pdf
    • http://files.fenwaywestfield.com/uploads/1/3/2/6/132681033/c264ee13e.pdf
    • http://relaxow.myowild.com/uploads/1/3/0/8/130814328/ferixetidawo.pdf
    • http://files.timewithschweitzer.com/uploads/1/3/1/3/131384113/titikolazi.pdf
    • http://kefewojik.kennypughmusic.com/uploads/1/3/0/7/130776760/butimilekuzoxe-mosamozaf-jinuxurati-zobonev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/682557440.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9442/files/nugazojitefifote.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/saworogano.pdf
    • https://cdn.shopify.com/s/files/1/0449/0382/5575/files/temisiwabiwupuwudewij.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/fapevemobag.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/nisoronuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/51497993572.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/vopilikoro.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/bluestack_untuk_laptop_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/9728/2977/files/87651785645.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/86860668918.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/70930013913.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000678e.bin
81eede7ed8c499812628a55560bb27889cd88361217aaa9b3628a1f5bdf2a063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678E 5456 bytes
font_01_sfnt_off00007a08.bin
d0da49587253a0287cf5966c7470d7b59edbad8f5b0613b8f1412ed77a1188bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A08 10284 bytes

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