Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be33dda471d021d…

MALICIOUS

PDF

49.6 KB Created: 2020-08-24 23:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68601775c87173d390f2d62b93f70976 SHA-1: 41289b64ef03d4f3c59224d4c6e64de11db3751d SHA-256: 0be33dda471d021d1f2faf4a66575dbf58939123d2a37220194423745cbd9b4f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for 'marriage biodata pdf free'. The ML classifier strongly indicates maliciousness, and the presence of numerous links suggests an attempt to distribute malware or phish for credentials.

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=marriage+biodata+pdf+free
    • http://files.mykmad.com/uploads/1/3/1/8/131856330/8fcd75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/tifiw.pdf
    • https://cdn.shopify.com/s/files/1/0466/2974/8901/files/baana_kaathadi_ringtones_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/fogabatadaxunaleni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9179/5873/files/band_of_brothers_season_1_complete.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/84016103899.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/60033056784.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/mosenovapuxavemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/3359354977.pdf
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/vuzejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3976/files/ailanthus_excelsa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008579.bin
6ab57dc2e6bba584cfed8454a47d675a92f62629a90f18f32babd979307835ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8579 5144 bytes
font_01_sfnt_off0000970a.bin
b1d36f49bba61e522ce969f2d7fac9361bf81ef0f0c974b1bd20a302f1bd7e71
pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 10212 bytes