Malicious PDF — malware analysis report

Static analysis result for SHA-256 857783814235dee7…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 00:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c6747c450617bbe6425a34caca6e3cd SHA-1: d621b4d5d9c164e409ca2f73ce8ebbcfbe186667 SHA-256: 857783814235dee7921337a2a5be457992b7770eae296eb61aa39acdb59df7d2
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'casual leave letter format'. The primary malicious link, 'https://ttraff.cc/pify?keyword=casual+leave+letter+format', is designed to redirect users to potentially harmful content. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further malicious content.

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.cc/pify?keyword=casual+leave+letter+format
    • http://nudebat.midvalelincolnpto.org/uploads/1/3/1/3/131381021/7563610.pdf
    • http://files.stphilipandjamesnewbentley.com/uploads/1/3/1/8/131856105/7832515.pdf
    • http://wegibew.virtualpowerplant.co/uploads/1/3/1/4/131408061/3eb505504f46f8.pdf
    • http://denemomu.rotboxrustorations.com/uploads/1/3/2/7/132740214/6140051.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/10939403190.pdf
    • https://cdn.shopify.com/s/files/1/0433/5199/8623/files/5260651185.pdf
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/enduring_power_of_attorney_template_nz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/72214865676.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/18320533087.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/10425259706.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/muvez.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/volikopawil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/sezofaxojetur.pdf
    • https://cdn.shopify.com/s/files/1/0450/5042/9598/files/riwafuv.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_off0000607f.bin
46fa5ea0e70818c8a86e6a67fcb90265c46766091c045422ae489d046d4f773d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607F 4724 bytes
font_01_sfnt_off0000709b.bin
836c14f354dd113fab65f3daf51dd9f29d14f67cd54653bd7f7987d8b2968395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 10068 bytes
font_02_sfnt_off00009321.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9321 4324 bytes

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