Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ea8258a0fc2428…

MALICIOUS

PDF

57.6 KB Created: 2020-08-17 14:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57d02516c123451215d0dd68ee2d3010 SHA-1: a575f619b37e68977d0cb6abe5bf5a5a9ccc9b34 SHA-256: 16ea8258a0fc2428f9fe4d72a7032b7642832bd1c63d1fa7729e6129d73a3cd8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a guide, and the presence of many external links suggests a link farm or SEO abuse tactic. The ML classifier strongly indicates maliciousness, and the embedded links are likely intended to lead users to malicious content.

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.com/pify?keyword=get+her+back+guide+pdf
    • http://zuboxufuk.oileranimation.com/uploads/1/3/0/7/130738667/2696931.pdf
    • http://vokenira.fwparkerlibrary.com/uploads/1/3/1/3/131398360/gegabalo.pdf
    • http://sepopikin.marketingforimpact.com/uploads/1/3/2/6/132696030/7473869.pdf
    • http://files.bergeneducational.com/uploads/1/3/1/8/131856907/silag.pdf
    • http://files.books2film.net/uploads/1/3/1/4/131407469/juvanegarumilixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/sinhala_adventure_story_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0238/5816/files/59771250133.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/rexujafidelirixad.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4903/files/2072008371.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/75263091360.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/juvejaxisaguz.pdf
    • https://cdn.shopify.com/s/files/1/0445/6746/2047/files/another_hallelujah_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/bsc_physics_syllabus_magadh_university.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/gegonosemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/qu_es_neoliberalismo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/tulobako.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/tovobavuxeketesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/35435998684.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_off0000a414.bin
57c75eeba4e4652a7dce76339f1d141147770de15b0e0539dbc590583dfe640c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA414 5444 bytes
font_01_sfnt_off0000b693.bin
9da0dd386e241310e65e4d62eebec1a426422c8cd087d6fb63c3e90d3e1dfe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB693 10272 bytes

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