Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b34b9f8fb1c2e…

MALICIOUS

PDF

61.5 KB Created: 2020-08-07 16:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc327556f7f9543075397643ae1a91a8 SHA-1: f86bb39f685f6b9161a47fd3cd6e9d0951aae7cd SHA-256: da4b34b9f8fb1c2ec0e8db39fd27bed0954f6815666de15ba4998a1a3e2c96ca
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=callan+method+stage+7+pdf+download'. This URL is also present in the document body, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated.

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=callan+method+stage+7+pdf+download
    • http://files.bernerayhistorical.com/uploads/1/3/1/3/131380297/vokemejixabetubimar.pdf
    • http://files.rentingpartnerships.org/uploads/1/3/2/8/132815318/eefa775.pdf
    • http://files.centerforcopyrightintegrity.com/uploads/1/3/1/3/131378899/vuwegodo_mulaporegitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3981/6861/files/75005169752.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/teks_asmaul_husna_dan_doanya.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8423/files/6110557330.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/how_to_turn_on_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0432/7781/1867/files/monografia_sobre_el_cambio_climatico.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/voruwixajejozopitirimago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6822/files/adrenalina_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/sejarah_arbitrase.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/sinezufojivudukajesegew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/maremafudukas.pdf
    • https://cdn.shopify.com/s/files/1/0440/2066/2422/files/estar_conjugation_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/53974991050.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_off0000b3b0.bin
a635f6b8e0aa2faa97b7a16439d049076294a1b192455e45d7443d62bd71732e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 5436 bytes
font_01_sfnt_off0000c623.bin
9414cf017fbc4d5bdef14c379f11c95c9e1317e88e89d756345c994c0631ac61
pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 10120 bytes