Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c995f52c67dba5b…

MALICIOUS

PDF

52.0 KB Created: 2020-08-05 08:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22355bc2dcb2c7e17ccdfa44a9d007c3 SHA-1: 9ed059f5d0b0c2eca9f2e6897d4ef829f81ac454 SHA-256: 8c995f52c67dba5b909c9164f08e18722495f7c59755d3200ce2a56a1818c263
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a document about bank exam synonyms. The document also hosts a large number of other PDF files on Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via the embedded 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.com/pify?keyword=most+important+synonyms+and+antonyms+for+bank+exam+pdf
    • http://files.artchaucer.com/uploads/1/3/2/7/132710601/bezox-papep-bosexesokuxuwus-kijetese.pdf
    • http://files.naturalhealthprotocol.com/uploads/1/3/1/4/131438142/9265671.pdf
    • http://files.digitalmindset.ltd/uploads/1/3/1/1/131164573/sodepufesas-fedejetuka-kafiwujibugo-kadusezet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/18024754213.pdf
    • https://cdn.shopify.com/s/files/1/0431/2963/4970/files/83476188550.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/garigixafepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/bulanivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/soburozanadogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/32443099447.pdf
    • https://cdn.shopify.com/s/files/1/0432/3603/2680/files/popovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/58207108699.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/samsung_bd-_d6500.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/bis_prot_warrior_classic.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/dedepumobidenozikok.pdf
    • https://cdn.shopify.com/s/files/1/0434/8438/1350/files/50236134487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/86063633030.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/92540339161.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_off00007f43.bin
2ee6e874e56bb3788bbba4c076edefa7931ffb674666701cd3e14c3529b4a3d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F43 5320 bytes
font_01_sfnt_off00009152.bin
623f651eeb82185fb1a0c2c034c922e43ef0402e49f2f0c072422b6b2e197c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 10148 bytes
font_02_sfnt_off0000b3c8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C8 4324 bytes

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