Malicious PDF — malware analysis report

Static analysis result for SHA-256 442e52739340cb30…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 22:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a85ce58cf87caa61f989d554f0a08a SHA-1: 5fb78b04fcfe15a8224048de4cc9cb659d70b795 SHA-256: 442e52739340cb301feb51fb898c6ee88769362640f5e869e4d52bc7581aea30
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=cms+1500+fillable+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'cms 1500 fillable pdf', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm strategy to obscure the malicious destination.

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=cms+1500+fillable+pdf
    • http://files.outofipswich.com/uploads/1/3/1/6/131636988/jepudawekid_pabok_fowisuwubavaxe_kutunerawimik.pdf
    • http://files.simonlaurieart.com/uploads/1/3/0/7/130738875/vutewomegivakufido.pdf
    • http://files.lakeisabellabassclub.com/uploads/1/3/2/6/132695832/c1eedae2.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/48775097433.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/bepobitujetulagimu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/953228354.pdf
    • https://cdn.shopify.com/s/files/1/0435/9415/4146/files/how_to_insert_symbols_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9124/7779/files/2629530414.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/30535477699.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/fipixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/80252806289.pdf
    • https://cdn.shopify.com/s/files/1/0431/4264/3868/files/62963917739.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/43359097447.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/kofefixivem.pdf
    • https://cdn.shopify.com/s/files/1/0431/8871/5682/files/pofagosodojuxonato.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/
    • https://cdn.shopify.com/s/files/1/0428/8125/35

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006547.bin
c7090c0d50be1708349abe0b7e7c07b1b65a523e3739a0f6309b57ad5835564f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6547 5456 bytes
font_01_sfnt_off000077c4.bin
c6cf6e18575dffd36f1f5a3e5262b1d83b508a2e191de155b4c445a64434980b
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C4 9988 bytes