Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f98db7c0bda6a4d…

MALICIOUS

PDF

43.0 KB Created: 2020-08-22 19:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc98bf39571ee7d59fcccf082f7e165b SHA-1: 59276bcdb7fa7edfb4dc9303df307b81190a8d00 SHA-256: 1f98db7c0bda6a4dcbbc65d266c0176fc1716f6fe346c3d548bfe928893d19fd
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free forecasting template, which then leads to a large farm of SEO-optimized PDF files hosted on Shopify. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a link farm or redirection scheme designed to distribute further malicious content.

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.com/pify?keyword=forecasting+excel+template+free
    • http://files.evaslebanesecooking.com/uploads/1/3/0/7/130739625/5012ffa.pdf
    • http://files.art-rogue.com/uploads/1/3/0/8/130813778/zidasazun_komaza_wejinusibopi_bubopiz.pdf
    • http://nupakem.richlandcountytransit.com/uploads/1/3/0/8/130814310/tigosonoxo.pdf
    • http://files.gutfreundcornettart.com/uploads/1/3/1/4/131454699/8444265.pdf
    • https://cdn.shopify.com/s/files/1/0447/9811/6006/files/midigipixufifidireka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/zodugosumumurite.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0439/files/lowitovofemem.pdf
    • https://cdn.shopify.com/s/files/1/0432/2633/3351/files/jenosesud.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/jedolosiwokufojona.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/catholic_mass_readings_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/giberosolesosufezatozojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5557/files/technical_analysis_by_martin_j_pring.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/beach_background_images_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9488/2984/files/nuwave_induction_cooktop.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/58717419280.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/33932672732.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_off00006980.bin
69feeedd37e7dab9ccbb1d4d2dd114caa7b49b9949faf54fee22c022355ce5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6980 5360 bytes
font_01_sfnt_off00007baf.bin
880ebaec6e83f38910b2fda4725f1998df563f3325f31cc49599e367609f0305
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAF 10380 bytes