Malicious PDF — malware analysis report

Static analysis result for SHA-256 7576cdbbc313adca…

MALICIOUS

PDF

41.1 KB Created: 2020-08-05 05:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e470368462ff02cc5befcf2d46b1126d SHA-1: 8b2adb66c720262aa83f4ecb51d8964d7953390e SHA-256: 7576cdbbc313adca8a4d5b5fd9952309b5b968082ab0f216bf38d43e1cbe8397
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body contains the text 'Bolt and nut size chart in mm pdf', which appears to be a lure to entice users to click the malicious link.

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/pify?keyword=bolt+and+nut+size+chart+in+mm+pdf
    • http://files.farahnayeri.com/uploads/1/3/0/8/130874317/2251402.pdf
    • http://files.dsbcyouth.org/uploads/1/3/2/6/132695732/kuxafenukokapivikuji.pdf
    • http://rikix.mardenridingclub.co.uk/uploads/1/3/1/3/131383791/dopapopolax_suxorupekekufim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3077/files/13926374521.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/bufupupewubitinitob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/nikivinesero.pdf
    • https://cdn.shopify.com/s/files/1/0433/2116/3941/files/diniwarojemafalodivelane.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/76345000684.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/roguretefokuxawibib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1968/files/figaxelivapekilujel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezaneseku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/30734811358.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/lowes_trussville_al.pdf
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/90949981352.pdf
    • https://cdn.shopify.com/s/files/1/0436/4523/9456/files/1749876098.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_off00005c38.bin
583819c8e6cee3c8a0353c9c982f0a96f907181055e3ecbebdb9a436f8df7ca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C38 5492 bytes
font_01_sfnt_off00006ec6.bin
6b7d76348bef64d2f34baa9b103932343152f0e104be9c745acdf3ffc724528b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC6 12576 bytes