Malicious PDF — malware analysis report

Static analysis result for SHA-256 db50042d167e348c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 21:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21acdf5cd9b1d306662f3ed17e47d090 SHA-1: 311ddabb96109c4f9e52f0589af9680e7ecb3d24 SHA-256: db50042d167e348cb0cf8e4c47cb1164c127446a0588448742c776306dd0be33
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 30 external PDF links, many of which point to potentially malicious redirectors. The primary malicious link, 'https://ttraff.ru/pify?keyword=happy+diwali+whatsapp+stickers+free', is designed to lure users with a deceptive offer. The document body, though heavily obfuscated, contains references to this lure and other URLs, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

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=happy+diwali+whatsapp+stickers+free
    • http://zarupiv.vincentsgermanshepherds.com/uploads/1/3/2/3/132302868/2926444.pdf
    • http://velag.wiggsfamilydentistry.com/uploads/1/3/1/6/131636725/5783840.pdf
    • http://files.smaexhibition-upcloseandfaraway.org/uploads/1/3/1/4/131406807/dogiwozivojawox.pdf
    • http://lokiviniz.villamurialdoblog.com/uploads/1/3/1/8/131856462/pujovapekazapin_simekisuvof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/wimojezurupoteloduteduke.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/xuwasixubitijusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/16860852836.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0428/3092/1894/files/tiretezizivuwunoxura.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/children_s_bedtime_stories_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/20056127009.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/jupuxozuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/kilovokikemijajuzasukis.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/fedogizibovatag.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/10399763812.pdf
    • https://cdn.shopify.com/s/files/1/0437/4423/1575/files/company_portfolio_design.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/usga_handicap_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/97686276725.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_off000066af.bin
bd86c60b0ea969abca7f5823ba6ab8b2bbe161ebf458f132bdde4534790640e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AF 5464 bytes
font_01_sfnt_off00007951.bin
2f6f88a7468e8292b6ac02fec551f743f1c3747537ff2c6208f7e14b1ddf6b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7951 10172 bytes

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