Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb06411930e28f5…

MALICIOUS

PDF

46.7 KB Created: 2020-08-13 11:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1845b3a1f5154e66ae396cfed691fc20 SHA-1: 98807939785ce4e476bf1c3134dc44bcc807a028 SHA-256: 3fb06411930e28f5a30db14d00732e50c3d5d229989b682b0742db923b58e4d3
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is https://ttraff.ru/wb?keyword=logo%20modernism%20book%20pdf. The document body contains garbled text but includes the same URL and several Shopify-hosted PDF links, indicating a likely attempt to lure users to malicious content through a deceptive document.

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/wb?keyword=logo%20modernism%20book%20pdf
    • http://tunabomi.conceptfrontier.com/uploads/1/3/2/8/132814930/6766961.pdf
    • http://files.bartlettlab.org/uploads/1/3/1/0/131070327/7599519.pdf
    • http://kiferaku.yogalise.nl/uploads/1/3/0/8/130874043/2101109.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/24084549194.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/fasozurogupukuxor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/installing_nvidia_drivers_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/safesexidorupisemadunuto.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/43533787000.pdf
    • https://cdn.shopify.com/s/files/1/0432/7263/4533/files/gotoritogixulog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/57626287035.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/87922133595.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_off00006a79.bin
ef3d0de0b0c1090c77c7e7316f46adcf332e79b275f143f6909288a8a7e5db06
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A79 5264 bytes
font_01_sfnt_off00007c49.bin
250f7b761397532fc668ca42bc6ed0f18f47402cef4426b836b91ec0f0b8d1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C49 3856 bytes
font_02_sfnt_off00008b64.bin
9c71c650cc9b42decf7a2c316001acf2029940f5fb79fe644700747d10528662
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B64 10092 bytes