Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fff246422144b6c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3579828edbc2fe4cc706c460523138 SHA-1: c102799046ef9c038074a4d0ae8861574f77edfa SHA-256: 9fff246422144b6c89aa55281c1b5bf60141e7d783d4e7cf66cbaa4823e242e9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the text 'Advanced piano lessons pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness.

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.club/wix?keyword=advanced+piano+lessons+pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/nilupazagajokovowade.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/73254495638.pdf
    • https://cdn.shopify.com/s/files/1/0438/5583/9382/files/13036000783.pdf
    • https://cdn.shopify.com/s/files/1/0433/8040/8474/files/gizotolomokoxajo.pdf
    • https://static.usrfiles.com/ugd/c0b427_c340f0787da444b6b3c08bc0a31a67e8.pdf
    • https://static.usrfiles.com/ugd/edb4a7_5093f94511344304b9d31b8583ea45f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_3430b57eb72440158e15e13c15b71568.pdf
    • https://static.usrfiles.com/ugd/6cfc61_7873a2e69e8543ef950e77235a7b809b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f01de4e080714364a9ac9bfc411a4b7e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/fivazerar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/6958529137.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2904/files/hamilton_collection_plates_price_gui.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/understanding_life_science_grade_12_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/42240332263.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3102/files/danish_girl_imdb_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/balevogigadan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/85332214981.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/49465386121.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_off0000717f.bin
3766e0eb4715f9f7650dd73dda8b28cce212c12420c961893e11f120decfda59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717F 5104 bytes
font_01_sfnt_off000082f0.bin
6d1a499e3cba63fad60e5123f4bbd6d7bdaa531fb442818e2ebe47c9662dddd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F0 10352 bytes

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