Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f44822d7c640d6c…

MALICIOUS

PDF

137.2 KB Created: 2020-08-01 16:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f53e328b16d039bd23dcf7e9976b8fc6 SHA-1: 63744c4939a1fee9b7ee7fc3cbd54e0a70768ec6 SHA-256: 4f44822d7c640d6cf0dca1f9732ef68b0195feddcdd2e6530ae249c526a0b584
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the string 'Blanchard grinder manual pdf', suggesting a lure to trick users into clicking the malicious link. 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.cc/pify?keyword=blanchard+grinder+manual+pdf
    • http://files.airconditioningcambridge.co.uk/uploads/1/3/1/1/131164557/2f1425996e4dac1.pdf
    • http://files.everythingunscripted.net/uploads/1/3/2/6/132682441/89064.pdf
    • http://files.jasminquill.com/uploads/1/3/1/4/131406797/152afe33af1cbac.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/zaxotidotenidok.pdf
    • https://cdn.shopify.com/s/files/1/0437/4478/8634/files/23126397308.pdf
    • https://cdn.shopify.com/s/files/1/0432/4737/0402/files/jovatajejofifijojukupufal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6578/files/zetadasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/3314903995.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/50530148097.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/98919470002.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2374/files/74074617110.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/wulafukapagivag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0999/files/95201809435.pdf
    • https://cdn.shopify.com/s/files/1/0430/0675/4970/files/79697006884.pdf
    • https://cdn.shopify.com/s/files/1/0437/5075/2417/files/fekomuzimukazezopetaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/rafiwuvigunopimojida.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_off0001cd60.bin
5233d318a80179ce49787debd737487bd4f1e8cfb991b781714f08df0882bb5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD60 5440 bytes
font_01_sfnt_off0001dfbb.bin
3f8de4ba049c8a3d6374a9294509f3ea0bdc68400ce557763fb453de7e6c729d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFBB 17828 bytes