Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c5eb64167512a…

MALICIOUS

PDF

48.4 KB Created: 2020-08-07 22:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f0b10766f5bfe99fa0756419a4e3ac SHA-1: 7c54bbe8cae86738c17bbe40eca1975a34aea7cc SHA-256: 1e4c5eb64167512a691c5baafe7087bb8dd1d35aab5ce84edf4b06ebbe2a7cc9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects through ttraff.com, which is flagged as malicious. This suggests a lure to download a seemingly legitimate PDF, but the actual intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=booth+algorithm+for+multiplication+pdf
    • http://files.thetanneryofcoweta.com/uploads/1/3/2/6/132681192/7652304.pdf
    • http://files.psychiatristsofdenver.com/uploads/1/3/0/8/130814110/5017681.pdf
    • http://files.osvaldosautoparts.com/uploads/1/3/2/3/132302716/xukijatubokigin-kepoti-kijag.pdf
    • http://files.beckpayne.com/uploads/1/3/2/6/132695575/6036374.pdf
    • http://files.intricatetaste.com/uploads/1/3/0/9/130969424/6b419.pdf
    • https://cdn.shopify.com/s/files/1/0432/1837/0728/files/terisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/99990209259.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/17012101364.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/industrial_instrumentation_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6307/files/jonewababifoxiwirivewa.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/85035163433.pdf
    • https://cdn.shopify.com/s/files/1/0434/0049/5260/files/podeziwakidaxazejolopifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/sopex.pdf
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/swing_trading_with_options.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/javuxiduxudid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/zejetebapi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/tozek.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_off0000688d.bin
b5fc538a5fbf1560958ac5a6bc66e6c6556bc196c768f3334620d90e3c809ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688D 5440 bytes
font_01_sfnt_off00007aa8.bin
e79c1245e311817e02a880bae69f623c2e4e76ebd7fed23c0f7c1717aa3abc31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA8 6300 bytes
font_02_sfnt_off00008a01.bin
7f0908079839b5fa4556c221e4a6ecdc9cf77ddfcaf613fb6efc5da3d7ba9add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 13332 bytes

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