Malicious PDF — malware analysis report

Static analysis result for SHA-256 f769f1fb88280201…

MALICIOUS

PDF

51.2 KB Created: 2020-07-22 15:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df3bacbf94af647d990901a8e6002689 SHA-1: 863be86856e5b479a74b3ac6c31e99babd92cae2 SHA-256: f769f1fb88280201c04c26b4d8ac88918c6d85c951ec3b791c8d814fd63e9239
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack vector appears to be directing users to malicious sites via embedded links.

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=risc+v+architecture+pdf
    • http://files.outcomemedia.com.au/uploads/1/3/1/1/131164047/sivunujum_zateludofasefar_jozefe.pdf
    • http://files.recoveryspecialistsinrome.com/uploads/1/3/1/4/131483267/4357985.pdf
    • http://files.globalwarming1.com/uploads/1/3/1/4/131406369/xolawez.pdf
    • http://files.markshteller.com/uploads/1/3/1/0/131070527/8338419.pdf
    • http://files.lifeword.nl/uploads/1/3/1/4/131408117/d394ee73a78e.pdf
    • http://files.globalwarming1.com/uplo
    • https://cdn.shopify.com/s/files/1/0429/8460/3801/files/xovativotiwuxuvuxava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/91029329962.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/jowipenesur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/muxefuvewuxudebo.pdf
    • https://polotaxu.files.wordpress.com/2020/07/4719286050.pdf
    • https://gozikes.files.wordpress.com/2020/06/molijizavaximoxepafumiv.pdf
    • https://gutagaperub.files.wordpress.com/2020/07/10744026059.pdf
    • https://ratomanedaz.files.wordpress.com/2020/06/mumigigafu.pdf
    • https://darewubuj.files.wordpress.com/2020/06/85720566814.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/tanimukenawanumov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44219577828.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/52213819945.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/48378769648.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/wepepebemab.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_off00008a97.bin
90706edd163423c0fb3e592a3fc2ca681d8af2c0a4a938d4583b4311dc827e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A97 4944 bytes
font_01_sfnt_off00009b84.bin
8a2166e40995c5fdb6a3d04882743dd29b4a1cf45061d14cecd98be0a3d674d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B84 10472 bytes

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