Malicious PDF — malware analysis report

Static analysis result for SHA-256 158262d561a25c5f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 16:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61e2752174fdf2049b2d47e8f622b7ce SHA-1: 3daaf548fb25c415a2189983050294f4c943dac0 SHA-256: 158262d561a25c5f74f579048b2c5fcf51a9c97c619df38dc802616d0c109dee
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=informatics+practices+class+12+ncert+textbook+answers', which likely serves as a lure to a more harmful payload.

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=informatics+practices+class+12+ncert+textbook+answers
    • http://files.dentacarekenosha.org/uploads/1/3/0/9/130969371/tezosamujusifirix.pdf
    • http://files.libertystroops.org/uploads/1/3/0/8/130813364/3238981.pdf
    • http://files.friendsofcountry.org/uploads/1/3/2/6/132695551/9228883.pdf
    • http://files.emery-law.com/uploads/1/3/1/3/131381288/tisigimako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/3052/5590/files/31404389612.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/bufurexejusojazama.pdf
    • https://cdn.shopify.com/s/files/1/0460/1289/1297/files/bajrang_dal_ke_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/ligularia_reniformis_auckland.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/91714782450.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/50015136174.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/84129677506.pdf
    • https://cdn.shopify.com/s/files/1/0437/1444/5465/files/bourbaki_thorie_des_ensembles.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/kuzakeroderevomefik.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/wedding_day_timeline_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0436/1201/2701/files/14818448723.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0797/files/vabinugogokasekelojomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/93735637395.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_off0000632d.bin
d6d9ad2a7d534374cd1ef4d13b5ba9678fbf529421d636005fa2a5c33d78ce4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 5648 bytes
font_01_sfnt_off0000765d.bin
6566fc5671910f70c94686c711f6654f08865c7371754ca23973ecf09bb528ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765D 10288 bytes

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