Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a72cd5efe493553…

MALICIOUS

PDF

43.8 KB Created: 2020-08-23 06:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a9de45b898bf0db24fec72bc928e27d SHA-1: b1b9e2da9d2491c1b9b74934b923ee9124c9a0a1 SHA-256: 8a72cd5efe493553c52aa3a58117345fc1626b8aac67b8da070dcba94f1c4f2b
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.ru, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Google play store apk 2018', suggesting a lure for users to download applications. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.ru/pify?keyword=google+play+store+apk+2018
    • http://vosugej.antsrus.com/uploads/1/3/2/6/132681482/3351142.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://repidu.northcobbphotoclub.com/uploads/1/3/2/7/132740764/b66e86.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1176/files/36028622732.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/sakimipijutosuvejaxorepof.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0095/files/9623960505.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/nalominad.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/biopsychology_by_john_pinel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/70935829709.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/suvaxetitizisagulep.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/bakimefaxososakugepoda.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5795/files/fiwavatulirelopolaxoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/empathy_philosophical_and_psychological_perspectives.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/xotuwi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/2499880672.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/wewexixusizex.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_off00005ea9.bin
352dc7c1c278966bf51cad1dd77f73ad5674b19db31389989a80f44f7d542c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 5340 bytes
font_01_sfnt_off000070fa.bin
e72385677fbca992e3ca4d11450ae06d461c04d7cceb9ca926780f21474256dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FA 10308 bytes
font_02_sfnt_off0000943f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x943F 4324 bytes

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