Malicious PDF — malware analysis report

Static analysis result for SHA-256 11411c2bce4b41e0…

MALICIOUS

PDF

122.3 KB Created: 2020-08-09 20:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acbea0eba57e7af28112eb00c174c952 SHA-1: 353f4397c8c5d47750c7d15197fcebbcd57f1097 SHA-256: 11411c2bce4b41e0cf5c967b91e7907c04e68a3f3f9936ee3efb3c33e759d636
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to potentially malicious redirector infrastructure. The document body contains a URL that appears to be part of a link farm or SEO manipulation scheme. No scripts were extracted, but the presence of numerous links suggests an attempt to lure users to external sites.

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=tales+of+the+arabian+nights+book+of+tales+pdf
    • http://geban.writerswhorun.com/uploads/1/3/0/7/130739415/dizifilujilif.pdf
    • http://files.rugbysafetynetwork.org/uploads/1/3/1/4/131452976/7341884.pdf
    • http://tevovub.johnscothist.com/uploads/1/3/2/7/132740892/jisukidurujive_midugojizo_muvanojugili.pdf
    • http://files.medesignusc.com/uploads/1/3/1/4/131452826/nezoru_ranuzekekoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1434/9219/files/python_progress_bar_console.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/bawilogorugil.pdf
    • https://cdn.shopify.com/s/files/1/0435/7046/2883/files/mijafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/rileferubitumapesulinepub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/sudo_without_password.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/jimelifuxafesisafewenape.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/lugasozupatokejaralepidid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/jorademo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/73248938605.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5464/files/synthesis_of_benzanilide_from_aniline.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/moloridarenisuweka.pdf
    • https://cdn.shopify.com/s/files/1/0430/2081/2441/files/wtyn_j_edm.pdf
    • https://cdn.shopify.com/s/files/1/0440/1741/8405/files/3868506023.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001aec9.bin
2ee5e7a0220a224e53afeb752e746fce77e54e0b04616a868b489f550893fece		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AEC9 25028 bytes
font_00_sfnt_off00017443.bin
afc4164942c40f2d8c06336fb10d453f885464a2b9dd367f17a17501e8e84445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17443 5456 bytes
font_01_sfnt_off000186c1.bin
a724172b6aeaad9b63eb4cdb36163dd8d34861186e52d5b036aa40e6d7180da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x186C1 12432 bytes

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