Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d9c4926ddd26c8…

MALICIOUS

PDF

47.4 KB Created: 2020-08-03 14:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee346ebb308fcbb5ac09c87c096e19f SHA-1: 0ef5ee486a44805effe3e4144a6a7677fc0ef319 SHA-256: d7d9c4926ddd26c83b2ccb088e3c1237cd897866bee8c54d0a0dd29f89bddee7
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF documents hosted on Shopify. The primary link directs to a known malicious redirector at 'ttraff.ru', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates a lure related to 'reading skills checklist pdf'. No scripts were extracted from this sample.

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=reading+skills+checklist+pdf
    • http://files.yourluckycharms.com/uploads/1/3/1/6/131636890/9237100.pdf
    • http://files.koshishpanindia.com/uploads/1/3/1/3/131379296/kirurumateka.pdf
    • http://files.fundacionchelaquintana.com/uploads/1/3/1/0/131070394/f229552e8e.pdf
    • http://files.fresnonutritionsolutions.com/uploads/1/3/2/6/132683111/9806049.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/84621011356.pdf
    • https://cdn.shopify.com/s/files/1/0437/4459/2021/files/jawusuxesukazimupufizodub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/7967925680.pdf
    • https://cdn.shopify.com/s/files/1/0441/2253/8136/files/nokaxegopekoxoruxaxubawi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/dilasamab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/vabelelaradut.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/74322499903.pdf
    • https://cdn.shopify.com/s/files/1/0434/2228/5976/files/vizufegitetugijerasijele.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/mabojimo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/69922895599.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/kuzokirofitawakarafiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/19241845287.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xaxigeruver.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/voxovifilodibivu.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_off00007c22.bin
4013520637e8a8539d8ba9f159e59906843229a63128bf7ecd0667f9e510335f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 5392 bytes
font_01_sfnt_off00008e89.bin
f23eaf380e5390236472c2476069cc3875156eefe38072e7b0f2775b926a2428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E89 10100 bytes

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