Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd81fe14c5d9751…

MALICIOUS

PDF

45.4 KB Created: 2020-08-31 16:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19ce59944ea06799f5494cfeaf716da SHA-1: 3c49e09d831bb81e2825280949220d8a191cf4ea SHA-256: fbd81fe14c5d9751144eec18b4baae1b6a914a160c061106fd80be30cb26a065
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://ttraff.cc/wix?keyword=comparing+food+labels+worksheet, which likely serves as a gateway to further malicious content.

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=comparing+food+labels+worksheet
    • https://static.usrfiles.com/ugd/b8c837_b1ed68ff68d54656877f64cb1e053e6b.pdf
    • https://static.usrfiles.com/ugd/89c6ad_b1923fd5623b48d5b2f15d68f5e27dcd.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f859ae14ad842668a2045c447be4da2.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/vasej.pdf
    • https://cdn.shopify.com/s/files/1/0461/9629/3790/files/galamijavoke.pdf
    • https://cdn.shopify.com/s/files/1/0465/5241/6414/files/main_verb_and_helping_verb_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/40478987224.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/welunofebebevalamosolatew.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/56959029541.pdf
    • https://static.usrfiles.com/ugd/0dd040_2f799e7defae4c91aa6f342d1c810f06.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3c088c13cb04a428c58dfef8b604f5f.pdf
    • https://static.usrfiles.com/ugd/0b46e6_cef31b9c86004a248d97ed4ebdaf7409.pdf
    • https://static.usrfiles.com/ugd/ae059d_fa0d4e164bbf4ac6affe6905bd1e0206.pdf
    • https://static.usrfiles.com/ugd/0a0016_4da3d1443b6d4807a3ff148a36d1877b.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_off000063fb.bin
e39126dd75cfce1da55c1f28edfe9d670b0aa08cb67bc808da531610709179cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FB 5560 bytes
font_01_sfnt_off000076c0.bin
a6b2258b86f6e8baa5f7976fc3e68a51b034d530a467e33adbac572abd001807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 10472 bytes
font_02_sfnt_off00009a9e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9E 4324 bytes

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