Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8730b8d36ba152…

MALICIOUS

PDF

41.7 KB Created: 2020-07-09 18:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9388663cecafb8c74c1fec1fd14391f SHA-1: 09d46ae2853c46bb06db417a97bd705ecc3f9f4d SHA-256: da8730b8d36ba152559bf052728f12da7b97afe3eab993ed5f6a4c327a59c350
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to appear as search results for an owner's manual, but it redirects to a malicious URL. The ML classifier strongly indicates malicious intent. The document body itself contains obfuscated text and URLs, reinforcing the malicious redirection attempt.

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.cc/wb?keyword=2014%20gmc%20acadia%20slt%20owners%20manual
    • http://files.hgcoffeeshop.com/uploads/1/3/1/3/131380288/sozuzosot_sukofat.pdf
    • http://files.thechargestation.net/uploads/1/3/1/0/131070895/48433d2aa0401.pdf
    • http://files.alicemaselnikova.com/uploads/1/3/1/4/131454850/detovelejovija-jofifofimajupob-xerefibigipama-pamimimisur.pdf
    • http://files.innovationsbuildingservices.com/uploads/1/3/1/4/131438741/3ca2f8128cf.pdf
    • http://files.thebeautyteam.com/uploads/1/3/1/4/131453198/nugoxojuvevo.pdf
    • http://files.alanbirtwistle.com/uploads/1/3/1/3/131383664/werox_xapedewero_bemidituziv_zurer.pdf
    • http://files.pinecrestcamp.org/uploads/1/3/1/3/131383398/jerulipot-rufuwipele.pdf
    • http://files.chloe-qin.com/uploads/1/3/1/3/131398066/vevukeg.pdf
    • http://files.palermiscollection.com/uploads/1/3/1/4/131438642/veserojap_kogowuzonabag.pdf
    • https://vimaxagowuno.files.wordpress.com/2020/07/56889365205.pdf
    • https://bozomejefew.files.wordpress.com/2020/06/51392301725.pdf
    • https://pasinegunuk.files.wordpress.com/2020/07/fukakosasupotadof.pdf
    • https://tazesetinud.files.wordpress.com/2020/06/68827690317.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21096031872.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69262577592.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.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_off000064d0.bin
2813a5927e6dc6391deb3a00500626419d703bad2266d07f3ca343413d3b1125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D0 5552 bytes
font_01_sfnt_off000077a5.bin
05109ffd69c0e4ff4972f6de0ab5de91c59361b3adaa96df367127ab8cce92b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A5 9948 bytes

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