Malicious PDF — malware analysis report

Static analysis result for SHA-256 94601a484da89b4d…

MALICIOUS

PDF

38.3 KB Created: 2020-09-01 01:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f7c36dd84db070ddda31e6a9d3b7565 SHA-1: ea9901ae804d04815b6c44e49b4a233d5b90315e SHA-256: 94601a484da89b4d4270e57bb63125ee2d91323d437f8ad25189eb93d5ee9e77
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a free application. The ML classifier also strongly indicated maliciousness. The primary attack vector is a user being tricked into clicking a malicious link within the document.

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/wix?keyword=ukulele+tuner+free+pro+apk
    • https://cdn.shopify.com/s/files/1/0455/6704/9893/files/online_admission_b._com_form_punjab_university.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/vutugewiribolinas.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/businessman_movie_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0439/2668/3816/files/printable_weekly_planner_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/74800704581.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/56531466590.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/51939618032.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/kivepurubevuzil.pdf
    • https://cdn.shopify.com/s/files/1/0435/3776/0408/files/minecraft_world_save_location.pdf
    • https://cdn.shopify.com/s/files/1/0460/4172/7140/files/tipos_de_chuleta_de_cerdo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/metal_carbonyl_notes.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_off00005a5e.bin
692839b99b647bc5b74681dd1f3dd2bae6e9f23b28b8710c12b4012e490fc5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 4772 bytes
font_01_sfnt_off00006ab0.bin
49a1ddd89c61979158f048375ef3e30c1351c40201dca1dcf23a764822869d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB0 10000 bytes

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