Malicious PDF — malware analysis report

Static analysis result for SHA-256 f224af747cc2cb63…

MALICIOUS

PDF

32.1 KB Created: 2020-08-30 03:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83cd46b9609de65d8f646e98c214d3c SHA-1: 96e6d6e5b869af62b8053f3d5077d0f11fa274a2 SHA-256: f224af747cc2cb633b1ce2c2f481a25a0fd37e0a80cc3a99037c5ea7ece24a03
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'BBC English Literary Companion'. The PDF also contains a large number of embedded links, many pointing to 'static.usrfiles.com', which is flagged as a link farm. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=bbc+english+literary+companion+for+c
    • https://static.usrfiles.com/ugd/6cf392_0195fb8bd8f94e91910b11b3e55ae2ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee54e5af58e14636a35fe75f85312b15.pdf
    • https://static.usrfiles.com/ugd/77d535_ed3044eff6dc43a5a46964747101e80c.pdf
    • https://cdn.shopify.com/s/files/1/0449/5792/5544/files/pilibilib.pdf
    • https://cdn.shopify.com/s/files/1/0436/5149/8142/files/loxagizuv.pdf
    • https://static.usrfiles.com/ugd/83b1b3_413117ca59784807869a886852d26579.pdf
    • https://static.usrfiles.com/ugd/5926b4_e13fb4ca2a574cf19ae6856399ffd7e9.pdf
    • https://static.usrfiles.com/ugd/5b9a87_cdcffecb0d9f427cb7426c68ce6ae158.pdf
    • https://cdn.shopify.com/s/files/1/0437/0127/2729/files/zuvigegigasiluvo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8422/6453/files/20131260525.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/94671715158.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_off00004095.bin
aee94b39eecf35e2c457fbc7a7f8e464314466ee775396bacd54fdc50a4b8c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4095 5720 bytes
font_01_sfnt_off000053e4.bin
f3559c883abe9506513316bd39dcac55ec6cdc749ce61f0d50f1cd85868067cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E4 9372 bytes

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