Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e40ef003247ced7…

MALICIOUS

PDF

36.0 KB Created: 2020-08-23 09:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db54d92ea86ea2a184d3a0033ccbee89 SHA-1: 4679b0f67729fff78d87e679fced1e09afbebc89 SHA-256: 9e40ef003247ced78bf4437b156e25a4e7f6e547720daca59acd72606fd05192
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used in conjunction with a link farm of other PDFs hosted on Shopify. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for industrial equipment manuals. The ML classifier strongly indicates maliciousness. The primary attack pattern involves tricking users into clicking a malicious link disguised as a document.

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=atlas+copco+air+compressor+gx5ff+manual
    • http://files.brunnersqualitydecks.com/uploads/1/3/1/8/131871501/barijasoza.pdf
    • http://files.architecturaldesigner.world/uploads/1/3/0/7/130775506/1922816.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1284/files/lefuwopexezota.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/22149688518.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/zezojabuju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0924/files/47192110470.pdf
    • https://cdn.shopify.com/s/files/1/0464/6872/6936/files/cara_beetalk_versi_lama.pdf
    • https://cdn.shopify.com/s/files/1/0436/7728/6565/files/zabituwifujaratidegif.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/2586356670.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/96414349589.pdf
    • https://cdn.shopify.com/s/files/1/0432/1699/4466/files/92801522806.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/89910145319.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/wapub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1158/files/58354921073.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/i5_4670k_overclock.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_off00004f5e.bin
3a3ad6637a3bf77a46b056fa23b01bc19ecd460218442d870393799e40c3df75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5E 5516 bytes
font_01_sfnt_off0000620f.bin
c135a211578b75a581b5a78d443d3790d3fd6fcf430202862c3522bb052d530c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 9592 bytes

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