Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5fef66d2b908e1…

MALICIOUS

PDF

52.1 KB Created: 2020-08-27 23:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5072d75e4216224b381fcbf24b6348 SHA-1: 3308dbddbbeac1931a638bab7cd57dd089365cde SHA-256: 8a5fef66d2b908e1f3a2dd20e76b873331370835b5671cde539c2fc6848e608c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.cc/pify?keyword=importancia+del+acetil+coa+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same lure text and URLs, reinforcing the phishing 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/pify?keyword=importancia+del+acetil+coa+pdf
    • http://rogudidun.vibrationalinstitute.com/uploads/1/3/1/4/131454950/4218353.pdf
    • http://vinoxelok.toowoombakoalarescue.org/uploads/1/3/1/3/131383837/ce7718b.pdf
    • http://files.kiwilearningcentre.com/uploads/1/3/2/8/132816066/fcce3.pdf
    • http://nemibuz.ostendmarineservices.com/uploads/1/3/0/7/130738836/913396.pdf
    • http://files.desertcrewphotography.com/uploads/1/3/1/3/131379049/2726283.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/36498859853.pdf
    • https://cdn.shopify.com/s/files/1/0440/5595/3558/files/producer_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0456/4162/9863/files/coraline_song_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/ruvofoda.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/zunubafewir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6631/0299/files/velaledu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/boboiboy_cartoon_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/22887428259.pdf
    • https://cdn.shopify.com/s/files/1/0428/6867/0620/files/15419001365.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/artificial_neural_network_manual.pdf
    • https://cdn.shopify.com/s/files/1/0464/4995/0888/files/bluebook_citation_21st_edition.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0533/files/the_chemistry_of_love_michael_liebowitz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0759/files/ubuntu_live_usb_disk_creator.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007464.bin
1d22a7caacb664e44b435dbc903eccd241fae160f0c05d935acbf1a5381d232e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 5060 bytes
font_01_sfnt_off00008574.bin
b91da1f9e2d25824d94eb36dfa25c41b9518caed532c1c5ebb3724bf624117fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8574 11804 bytes
font_02_sfnt_off0000ac5c.bin
99550976dfc1031cc88c38f1ea926cf85cee9dde3bc6029adec2b4c0e217538f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5C 16128 bytes

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