Malicious PDF — malware analysis report

Static analysis result for SHA-256 f844f1dff2e23063…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 01:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d670fdac7f6f7bcead07e6accaed7be2 SHA-1: 3981f84b5bf04feb1fcc85a883b510cb0427e461 SHA-256: f844f1dff2e23063148115544a947f3c394b39a1ee459bcac986b5d119038b33
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=free+download+urdu+pdf+books+and+novels, is identified as a malicious redirector. The document body text and the nature of the links suggest a lure for users seeking free content, likely leading to malicious sites or further payloads.

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=free+download+urdu+pdf+books+and+novels
    • http://files.velvetandtulle.com/uploads/1/3/1/4/131482864/dezejezutuxe.pdf
    • http://files.abaautismservicescentralwest.com/uploads/1/3/1/4/131437311/januratibofapigazir.pdf
    • http://files.deniskilcommons.com/uploads/1/3/1/6/131606208/427458.pdf
    • http://files.divinesoulenergy.com/uploads/1/3/0/9/130969819/d55ccdadbe3c.pdf
    • http://files.bluecruiseturkeytours.com/uploads/1/3/0/7/130776254/luvulepesurapij.pdf
    • https://cdn.shopify.com/s/files/1/0447/9565/8389/files/zopovisekejobaxepal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2783/2733/files/82158936914.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/waxupedo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9278/5818/files/backpage_topeka_kansas.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/bisoxozefiwozipajejadar.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/12688545442.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdf
    • https://cdn.shopify.com/s/files/1/0449/6100/5736/files/obtener_certificado_de_secundaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/77524386367.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/bejonobifabatagajigikuzid.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/indesign_export_smaller_page_size.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81988232477.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/pediatric_cardiovascular_examination.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/51377139020.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
stream_005_off00007f2a.bin
e6f99280aebb90595dbea02c03ba319c70ebc915c3b75bdb6c40ac1abf7e3935		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7F2A 17348 bytes
font_00_sfnt_off00004b54.bin
af5972939ab18eb1295946f83819b744d1c514b8a8093b5e1c8640508b9c6913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B54 5344 bytes
font_01_sfnt_off00005da9.bin
9836b617e034c08827b5813db7c3d374518134bc8d427c2cee59cc9cde22a1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA9 9720 bytes

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