Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a7fedd81a7a3fe…

MALICIOUS

PDF

44.0 KB Created: 2020-09-17 20:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2803ebcb55696bdc9a78cbbe803c3f07 SHA-1: 086997ca50d9b0492656319bbddae7603e261b0e SHA-256: 88a7fedd81a7a3fe8bb64d74193ffc6c2c7d64875b7f3ae5d85d90772cd5acd3
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links pointing to external resources, including a suspicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.link/wix?keyword=apk+file+android+studio', which is likely the primary lure.

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.link/wix?keyword=apk+file+android+studio
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/vefujaxuwejomoxemegexa.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/noxosovabamegar.pdf
    • https://cdn.shopify.com/s/files/1/0454/6953/2310/files/surah_baqarah_tafseer_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/xigomawew.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/51669613135.pdf
    • https://7a492280-7961-4697-9556-f354fa38445d.filesusr.com/ugd/5f4192_1c2666dd963a474c9e6c2e0c7c2bb162.pdf?index=true
    • https://74f3c69d-c401-42f9-b54f-27ee1ce9925b.filesusr.com/ugd/197ed4_79415b800ff64ce1b81932cdfe6db293.pdf?index=true
    • https://92c94d1d-462e-4d40-8ba3-f6bca0ee755d.filesusr.com/ugd/1e8759_9122f214589446ca9f5c33a2bd0046f9.pdf?index=true
    • https://8cdfa1dd-03ad-4c21-b518-c5f631fcdd10.filesusr.com/ugd/031dda_1914be98576149628b4c8bbca4f46bb3.pdf?index=true
    • https://cf2beb9b-2d83-4e1a-bc33-a5e65a185e3f.filesusr.com/ugd/154db6_e1b81d3291bd46a18b7935363dee4256.pdf?index=true
    • https://21dfc721-e62e-40e2-b662-456cb2f4d2b3.filesusr.com/ugd/a838c0_050e5c3c15fc4207844306baf7210e9b.pdf?index=true
    • https://b4eddc7f-90c7-4048-a67c-07c2e765c1c2.filesusr.com/ugd/63d3ad_975e0bb65d3347a0b57bf551c526b396.pdf?index=true
    • https://c7779ea5-4cb4-47b8-ad3a-0eaf79846211.filesusr.com/ugd/ade4e6_696cb1fa0df04f89b84f25b75f3bd4f6.pdf?index=true
    • 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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e8b.bin
32c3a3f42793b026a8d3a0944fd92beeba6a177e89f16c96387cbebaca6cbeaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8B 5088 bytes
font_01_sfnt_off00007fee.bin
e26cc6e2fe63ba629cce63a95fb9c9eb496baf6048bcca5f59ea74e859415e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 10360 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.