Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7345a118d3ce20…

MALICIOUS

PDF

33.0 KB Created: 2020-08-29 08:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc10feb978d4574dcd2ba2bde0a5428 SHA-1: 3000ebaeb9514bbe633a62f516d2d2b92f0c873d SHA-256: 3b7345a118d3ce20b9b22e535d8b4981def4916b829911f71f8cd3961f9b6e83
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver further malicious content. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'first class day care'. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted from this sample.

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/wix?keyword=first+class+day+care
    • https://cdn.shopify.com/s/files/1/0430/4414/3253/files/82648935807.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/5444755800.pdf
    • https://cdn.shopify.com/s/files/1/0429/4125/1747/files/phn_mm_chuyn_i_file_nh_sang_min_ph.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/98088589498.pdf
    • https://cdn.shopify.com/s/files/1/0440/1060/2661/files/54040403758.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/bogunafagafidezaxakego.pdf
    • https://static.usrfiles.com/ugd/b8c837_edb856a9c6ec4f37b96d4757c6fd5147.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2959c0194ca4f3ebcb6af47b4d3808e.pdf
    • https://static.usrfiles.com/ugd/b8c837_48646006ced8452bac9de811d8a80175.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6e593227de4e2e8719c2da2bdf19a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c1a766674b84f85988a419cb3e8f0a2.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_off0000466b.bin
799f214e632bf1aac5894f3ac58e4aa8ea77a678773b3a837e42f32bf56aaea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x466B 4988 bytes
font_01_sfnt_off0000576c.bin
8182cb080510ce6c55a91354f4d19224efab13e33de8cc5391bc939fa1fc2bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576C 9528 bytes

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