Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb17b035df989305…

MALICIOUS

PDF

37.2 KB Created: 2020-08-14 05:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd73f464fe2582e51acd7ce8d88aaf91 SHA-1: 9d64997600abb8b696bd262132c553b9fc39d8f1 SHA-256: bb17b035df98930535bac61e40d4de60645e3b0b8b0d884c8790dd2e234be628
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 directs to a known malicious redirector infrastructure. The document body text, though garbled, includes "Denso spark plug pdf", suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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/wb?keyword=denso%20spark%20plug%20pdf
    • http://files.kateandricklewisphoto.org/uploads/1/3/0/7/130776388/mifebukobusu.pdf
    • http://files.lockhartnoonanchiropractic.com/uploads/1/3/1/1/131164428/rapebubibara.pdf
    • http://files.garykitecomputerservices.com/uploads/1/3/2/7/132712005/6173644.pdf
    • http://files.derwoodmarket.org/uploads/1/3/2/6/132681579/mibemotojevap.pdf
    • http://files.sleepytimelab.com/uploads/1/3/1/0/131069812/e44400847.pdf
    • https://cdn.shopify.com/s/files/1/0430/8821/6217/files/wixutijikepabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/wigerusalikarifori.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/24549331722.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/mevawojolinirajaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/digoxokonexekapexolo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6555/files/xirajidenewaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1036/files/exemplo_de_um_texto_expositivo_argumentativo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/waxoguzosigolesetedulada.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/class_javalaunchhelper_is_implemented_in_both.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/tukatigajedofofunove.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/stroke_physiotherapy_assessment_form.pdf
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/fabiboxowigokizes.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_off00004e06.bin
2bba8cb0957621beeb3c9900036f4ac26a6c6d96cdf75c2bc1446491824e0bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E06 5272 bytes
font_01_sfnt_off00006002.bin
ded115d033a4ca0eb02393143bdf2eb91914e0614130b9a7ee91e11b2c73bbec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6002 12528 bytes

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