Malicious PDF — malware analysis report

Static analysis result for SHA-256 91af320aa09e71cb…

MALICIOUS

PDF

59.5 KB Created: 2020-08-13 15:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 225dccfdd8011cfcee3d2d7b6004f47b SHA-1: 8ea6e099b6b9c192fe9addf606737e2e71739f4d SHA-256: 91af320aa09e71cb2879ce370e2cc5ebba7e497ea11150bf847d0d893b9e5420
154 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm designed to obscure the ultimate malicious destination. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to a phishing or scam page.

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=pseudolo+plauto+libro+pdf
    • http://files.sweetspotstrategies.com/uploads/1/3/0/7/130776619/lajasozewel_mezobozapumim_kolovelap.pdf
    • http://files.ralphroyrealty.com/uploads/1/3/1/4/131454012/vuvamopo-vonajudo.pdf
    • http://files.kobrathelabel.com/uploads/1/3/1/3/131379939/tovusiweme.pdf
    • http://files.accesseuropetour.com/uploads/1/3/2/7/132740181/vuzopi.pdf
    • http://minasag.royalpawsmobilegrooming.com/uploads/1/3/0/9/130969723/cdb1701a236.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/44655787084.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/23341870103.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7194/files/43397523821.pdf
    • https://cdn.shopify.com/s/files/1/0434/9142/6469/files/bs_bahl_organic_chemistry_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/12888315147.pdf
    • https://cdn.shopify.com/s/files/1/0450/3057/2190/files/alto_professional_ts215.pdf
    • https://cdn.shopify.com/s/files/1/0432/7440/3996/files/25237790122.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/schaum_s_outline_analytic_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/48774658007.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/bibuzej.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/pink_floyd_coming_back_to_life_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/gadopinesevafeduwuvitifi.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_off0000a7ad.bin
d9cf05e5baadc8839eab549c752c149e0cdf2c192aa60f6b5e61f3a992aeb234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7AD 5176 bytes
font_01_sfnt_off0000b948.bin
b9cfb96ab90534080e2e385f257e22b7e7172b421103c53cced07684eaa9e511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB948 13244 bytes

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