Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cd30c0fdffa41c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2edc7f07efa88b4c31e986338f0e25 SHA-1: 38ec3b481cf07c5f6b720e2500a12e5c76f0a9b8 SHA-256: a9cd30c0fdffa41c5fa586102f8465ac1a0a5bfe98e4699d60051b90419534bc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=install+adobe+pdf+reader+plugin+chrome'. This URL is designed to trick users into downloading malicious content by impersonating a legitimate software update. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign Shopify domains, likely for SEO manipulation to improve the ranking of the malicious redirector. No scripts were extracted from this sample.

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=install+adobe+pdf+reader+plugin+chrome
    • http://files.danielkies.com/uploads/1/3/1/3/131379530/e97c1f6ce77824.pdf
    • http://dowit.eastsuperiorcc.com/uploads/1/3/1/3/131379578/23e21134fbce14.pdf
    • http://jigasa.trefoilintegrity.org/uploads/1/3/1/8/131856907/5ec4c6b5.pdf
    • https://cdn.shopify.com/s/files/1/0429/6094/5305/files/hoover_spinscrub_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/58904632711.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/bewasesok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/andromache_racine.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/kijopudokimubenijumonomew.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/76860811501.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/pengertian_akuntansi_syariah.pdf
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/37589174219.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0454/0868/2152/files/areds_2_study.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/carica_papaya_leaves_medicinal_uses.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0932/files/xukelub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/kodi_17._3_ipa_download.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_off000060d5.bin
153979c3494a2c63d8eb47e8f2912d2591d26a9d8100e80b660ea78394faf6e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D5 5648 bytes
font_01_sfnt_off000073d3.bin
c39d2149ca2f17053da6655f13a5cd5f1fbd0cfb42b24bc692b72a8a6767d867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D3 10464 bytes

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