Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77d1a9b072035e0…

MALICIOUS

PDF

78.6 KB Created: 2020-07-31 06:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf16e38051a292474a833246145d3533 SHA-1: 95b24299d5f37d0d24715faaccea71ac235273eb SHA-256: b77d1a9b072035e06dc3c3b0875eafa27ce70720116b8e7a553a1ea63f904077
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute content or lure users to various sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=agamemnon+seneca+pdf
    • http://files.azdirectmobility.com/uploads/1/3/1/4/131437873/2848040.pdf
    • http://files.rebeccahodel.com/uploads/1/3/1/4/131410685/genolijudiwekota.pdf
    • http://files.findanazhome.com/uploads/1/3/0/7/130776200/jofivomidujut.pdf
    • http://files.teamkili2020.com/uploads/1/3/1/0/131071157/6030147.pdf
    • http://files.networkerstec.com/uploads/1/3/1/3/131380158/zokirelidevu-vajebetuka-kotit-rizobuziwoneda.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/xigijoketujanuregiwabosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/48425730984.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/71845699058.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/zodemumiferozubuzevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/migexozamoxasilunel.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/8338545527.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/16304906454.pdf
    • https://cdn.shopify.com/s/files/1/0439/4975/2478/files/nuporiterun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/81817287410.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/49404249701.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/27527363896.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/zomekuraveretis.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_off0000eaf0.bin
34b598eae3e21161a2004b9f61ab20b6ba87857ce3e8bd0aee911eb6c1921dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 4996 bytes
font_01_sfnt_off0000fbd3.bin
8fd930f49e92f6e25e4704e7f6e31f21e6d16ecedef922764bad0fcd12c9f785		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 17476 bytes

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