Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e5d7fdaabd1ad9…

MALICIOUS

PDF

60.2 KB Created: 2020-08-17 00:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34631f59ac85afdc4df3251f0ec9e620 SHA-1: 31422aedaa4696dbc400934e510d635bef8bb38d SHA-256: 20e5d7fdaabd1ad9859e420cf09158f296b8267086c436bb0459225ece6e44fa
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link to a known malicious domain, indicating a phishing or scam attempt. The document body, though partially corrupted, contains text related to a 'wholesale inquiry email template' and the malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site via the embedded URL.

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=wholesale+inquiry+email+template
    • http://files.karamarie.org/uploads/1/3/0/8/130874030/worexogafar.pdf
    • http://files.goingalloutfitness.co.uk/uploads/1/3/1/4/131453588/zukuvixenuj-futexo-falude.pdf
    • http://jatekodu.dizacflowers.co.nz/uploads/1/3/0/7/130775701/2404656.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/58772176001.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/19089564428.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/board_of_directors_duties_and_responsibilities.pdf
    • https://cdn.shopify.com/s/files/1/0438/3549/0466/files/10533810758.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7197/files/62319668150.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/kingdom_hearts_2_final_mix_iso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/fuvejukitabadimazidufuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/boca_do_inferno_gregorio_de_matos.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8076/files/birid.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_off0000a73d.bin
1c6613dbef4c9c5f760e9c0179e0d19be73be6645b1db1b846fde868a1effc2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA73D 5300 bytes
font_01_sfnt_off0000b926.bin
39255f6480ff0394c0e3c3e28d972f5ccdbedb01d53f2d439555a3eb530beffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 13424 bytes