Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e0ae72e3e6b574…

MALICIOUS

PDF

40.9 KB Created: 2020-08-20 04:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4fb809ac4afbf23bc19d04381d60a2b SHA-1: bebdc26111a2c4e3c39e5bb2d1d67189407fa364 SHA-256: 10e0ae72e3e6b5740d5cbb42fb37c7e82ab76a0c0a32ab65872fa85740b4156c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL reinforces this. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF files hosted on various domains, suggesting a link farm or redirection scheme.

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=weird+questions+siri+answers
    • http://files.sustainablemedicine.org/uploads/1/3/0/8/130814926/sivatepetuno.pdf
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdf
    • http://files.blackjacksautobody.com/uploads/1/3/0/7/130739697/vugifoteluwiwi-juvofelusude-nipuxofidugaxi.pdf
    • http://dapijuko.elizabethcopeland.ca/uploads/1/3/0/9/130969723/zupogerudafajub.pdf
    • http://vapeve.wilsonaussies.com/uploads/1/3/2/6/132682646/besewogowunefunovib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/dalukeluleju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/19061233383.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/17058214101.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/lonuvafixibajiwigiwatuxav.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/80080947098.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/94910939454.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/kasaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/hranin_porucha_osobnosti_a_jej_lba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/aerobic_dance_workout_for_beginners_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3359/files/catalogo_hinode_2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9724/4316/files/11843813184.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/anaerobic_digester_design_calculations.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_off0000629b.bin
fc6acd70b88a030df1bfab890daebf668e61ea0db210b9fc7ff595490943a1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 5020 bytes
font_01_sfnt_off000073ca.bin
4639089931c6fea5fc74fc77bbf3a702df014f961c1465ff7c70a85048acc333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 10352 bytes

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