Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49081213bd5b3fb…

MALICIOUS

PDF

45.9 KB Created: 2020-08-18 14:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf9dcea1406300f9ef2680e5a26d0dde SHA-1: 51917a598e7c32dae2a8dd29c5380dc7da57bc9e SHA-256: c49081213bd5b3fb47603436b121b8f0f8e2149d025e1743cc49bbf91418a40b
152 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 designed to lead users to malicious sites. The document also features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content broadly. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

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=bereken+rente+op+rente+formule
    • http://bokigaxif.jewersdoors.co.uk/uploads/1/3/1/3/131379732/5ffa80ab3b38c.pdf
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3219/0876/files/spoken_english_offline_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/30641149767.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/jimubolowuvodizirekex.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/pec_minor_stretch.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/putovuravipemigekobig.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8850/files/date_format_in_report_builder.pdf
    • https://cdn.shopify.com/s/files/1/0437/7454/1981/files/apache_tomcat_server_administration_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/70440750512.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/84118697161.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0729/files/pufiporekudumorakerab.pdf
    • https://cdn.shopify.com/s/files/1/0440/8374/0822/files/45622134110.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/budget_sheet_printable.pdf
    • https://cdn.shopify.com/s/files/1/0434/0704/8860/files/97429897804.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/78326242337.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_off000060d0.bin
9b152a8df59d29aa262c0f28ca705de45fe08caecd2d8e4e7916260d08068ea6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 4772 bytes
font_01_sfnt_off000070ff.bin
4e2cacf50b2635959d7432a9aa1c871814d37db6762b6a7ab63e6a768a659fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FF 10908 bytes
font_02_sfnt_off000095e0.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 16036 bytes

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