Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db791b048fcf8e8…

MALICIOUS

PDF

49.7 KB Created: 2020-08-20 08:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22c43b87148ce15b6a502d2c36686907 SHA-1: 4856e6605e0cc14557d4f2bb8641e3b691aaf653 SHA-256: 3db791b048fcf8e85c24a66988a51014dc714431692f1ac48f569fb6e69fbfb3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly legitimate documents. The primary malicious link identified is https://ttraff.ru/pify?keyword=chatuchak+market+guide.

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=chatuchak+market+guide
    • http://ruranap.necoraindustries.com/uploads/1/3/2/3/132303354/7214223.pdf
    • http://files.255milledge.com/uploads/1/3/1/6/131637606/kowusex.pdf
    • http://files.savannahgreendirtdesign.com/uploads/1/3/1/0/131070109/9903756.pdf
    • https://cdn.shopify.com/s/files/1/0447/0043/4586/files/sahih_bukhari_hadees_in_urdu_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/78356878291.pdf
    • https://cdn.shopify.com/s/files/1/0432/1021/1491/files/adobe_reader_chrome_plugin_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/lavekisalorukina.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/zubezulu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/audio_visual_aids_in_nursing_education.pdf
    • https://cdn.shopify.com/s/files/1/0435/5027/7783/files/tenuwurigadogiwote.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000655d.bin
fded95aaaa2b20793f9af7ce6cfa0453c012dc0dd1da0d1d27aa689b59cc1e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x655D 3992 bytes
font_01_sfnt_off0000738f.bin
9471de83549496272858bf8b0456fd53445b5c5ef8e41472f2d9e3920e90f841
pdf-font-stream PDF embedded font (sfnt) at offset 0x738F 5112 bytes
font_02_sfnt_off000084c1.bin
d52427c20a34349d3b654ac30222deac5268d4533592bdfc5a2ac1007eedcc35
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C1 3048 bytes
font_03_sfnt_off0000913f.bin
20b96292bd49a0462cc7fd4ed862732839ba85017a5496004cfb6e507e81ff1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x913F 12420 bytes