Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ed7d6c95d31437…

MALICIOUS

PDF

41.7 KB Created: 2020-08-01 14:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71f8047605aeb1cea2e247e3dec7f79 SHA-1: b080a69bdffa319f2774f6b0265270ef3d150d57 SHA-256: 61ed7d6c95d314379a9e006922e8693c34b9096dc116864524bf2b81185977de
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=java+download+32bit'. The document body also contains the text 'Java download 32bit', suggesting a lure to download potentially unwanted or malicious software. The presence of a large number of external PDF links, many with numeric slugs, indicates a link farm intended to manipulate search engine results, likely to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=java+download+32bit
    • http://files.statebirdtogo.com/uploads/1/3/1/0/131069968/gobudexalizakujoki.pdf
    • http://files.studioofcreativity.com/uploads/1/3/1/6/131606502/7860484.pdf
    • http://files.starquarryfarm.com/uploads/1/3/1/4/131438680/nufivevuwa-senobavabinoj.pdf
    • http://files.communitydevelopmentprofessionals.com/uploads/1/3/2/6/132680813/9551374.pdf
    • http://files.ontarioexplorations101.com/uploads/1/3/2/6/132681308/1465890.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9191/0038/files/55242100943.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/74180818157.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/40984996952.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/fagugupasodiwaxodumete.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/bexulineximapimadije.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4170/files/60443859795.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/basezewatepadigegodud.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/sewiwivexasapobemol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2097/files/lezokitajuduwajufukex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/vanakosutokonovaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/bajobanadom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/osrs_spirits_of_the_elid.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_off00006550.bin
29667d7c29aab971a594b2095d24177beee5ad977e085b5b0646e6ab4d71eaf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6550 5124 bytes
font_01_sfnt_off000076ed.bin
e40ac83bcc70ba0d68508f994ee28d887b71d44d079113d418f98ca958a12ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10296 bytes

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