Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afc604c833b5932…

MALICIOUS

PDF

53.2 KB Created: 2020-08-14 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e40dc98356a85ffeb562bfec285cf4ae SHA-1: 84180e584aec296746b2bb18d0b7f61db571eecf SHA-256: 1afc604c833b59326f7d0271f968407679aab60ed34cae5d43f7a113d52b2393
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=chihiro+fujisaki+gift+guide'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are hosted on potentially suspicious domains. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the malicious URL and references to a 'gift guide', suggesting a social engineering lure.

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=chihiro+fujisaki+gift+guide
    • http://powagoz.sandyoppenheimer.com/uploads/1/3/1/3/131380158/pitevera.pdf
    • http://files.cosmeticsupport.com/uploads/1/3/1/4/131452982/kumewirekas.pdf
    • http://rudinuxe.blacklines.org/uploads/1/3/0/7/130739430/6705550.pdf
    • http://files.binksgames.com/uploads/1/3/1/3/131384335/9959125.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/air_pollution_control.pdf
    • https://cdn.shopify.com/s/files/1/0446/2352/8099/files/acrylic_painting_for_beginners_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/ielts_general_training_writing_task_1_sample_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/zinetowixuwajowujuzukaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/benim_hocam_trke_kpss.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/tizuzagugup.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/xaxelonuvunowefifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/tavefonotamugemigaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/wekuwirufulutafaminazul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/62203433158.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/69033209557.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/abandoned_farmhouse_poem.pdf
    • https://cdn.shopify.com/s/files/1/0438/9784/7976/files/miopia_astigmatismo_hipermetropia_presbicia.pdf
    • https://cdn.shopify.com/s/files/1/0433/0825/3344/files/learning_node_js_book.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_off00008562.bin
9f9bcc7fedbed17d6454f8bdd4811a0ecb1eb654465ac7801e1395e1178b36e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 5076 bytes
font_01_sfnt_off000096c3.bin
8ad370379c4794aff4347ab5e6b95edb380d977d37728ac6d68e62dd7317bf75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C3 10216 bytes
font_02_sfnt_off0000b9b0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 4324 bytes

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