Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef0feeb520ff842…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 07:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157f24a92fc5e0ccec733036383c0d49 SHA-1: 28b7e261f17b6838c550eee9da8368b4b8df0b0d SHA-256: 7ef0feeb520ff842549fc065cacc701bbd311dc79a23cf8d4870b4ea2f8f0677
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external resources, classifying it as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=english+grammar+questions+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify-hosted PDFs, suggesting a lure to download further content or navigate to malicious sites.

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=english+grammar+questions+pdf
    • http://files.hacksawstella.com/uploads/1/3/0/8/130814055/2511888.pdf
    • http://files.evergreenscoffeeandbakeshop.com/uploads/1/3/1/6/131636689/jadaradujo.pdf
    • http://nusadazel.rachelvphoto.com/uploads/1/3/0/8/130814328/9f020011e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/changing_firefox_font_size.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/british_council_ielts_general_reading_practice_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0449/1198/4795/files/alter_ego_a1_corriges.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/29537168951.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/wotibadozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/battlefield_of_the_mind_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/xebodaxolevogo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/genetic_analysis_an_integrated_approach.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/nusosiv.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/branches_of_artificial_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/gozupibidusadaworig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevimija.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_off00006064.bin
9ff172349159cd62a5197cca2cf05d9f02a77e954af592cd865686d9f74b8529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 5536 bytes
font_01_sfnt_off00007307.bin
2fa5cd1eeefbdd7002a32fb39912d90e1cd073e0e053cb14c4bc484a81e10e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7307 10556 bytes

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