Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edbc74dc5556bba…

MALICIOUS

PDF

39.4 KB Created: 2020-08-18 17:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f01c28b82aab3402d7bb88d9183c4b8 SHA-1: 2ac363f0d4a5c708ccfce04da56f1edf69174d04 SHA-256: 7edbc74dc5556bba97fad294ccd1aaf7d442baac5ef3a2f3557d73705e7cd1c5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=nursery+rhymes+ukulele+chords+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of a large number of PDF links, many pointing to Shopify domains, indicates a link farm or SEO poisoning tactic to increase visibility and lure victims.

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/pify?keyword=nursery+rhymes+ukulele+chords+pdf
    • http://files.findingspecies.org/uploads/1/3/2/8/132814196/nafepitor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7287/1832/files/chateau_de_chambord_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/ritozusakufuwixotara.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/nhentai_food_wars.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/jasukezegadumugeloxofazo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/two_letter_english_words.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/faa_far_part_61.pdf
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/absceso_hepatico_amebiano_cenetec.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/fexaxapop.pdf
    • https://cdn.shopify.com/s/files/1/0435/0522/1784/files/zomulijesele.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_off00005ba5.bin
a9b7369d66fc55d78ed5c21f5a50c20e20ec07de4d5a9f8bb21a57cc6c23d355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA5 5320 bytes
font_01_sfnt_off00006da5.bin
4a9ec3f352d1e6e62102d8192b67836f41a2c74dc32855980be40f7e024063d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA5 10448 bytes

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