Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e12f427197ecb8b…

MALICIOUS

PDF

49.6 KB Created: 2020-08-17 09:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f4e1ccc7e02e087e735e32a54bc955 SHA-1: d07ae60fb78f23225414a27876a96099fd3de5fc SHA-256: 2e12f427197ecb8bcfb7024fc3a45c981b1789d385d7cd60707a4a41906d7eda
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into clicking on further malicious content. The document body, though heavily obfuscated, also contains this URL and appears to be part of a link farm strategy, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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=android+google+play+music+export+playlist
    • http://xobizome.catinc.org/uploads/1/3/1/3/131383544/5033600.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/youtube_video_downloader_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7142/files/45669807967.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/linus_tech_tips_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/hallelujah_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/9099/1521/files/pdf_file_reader_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/6395/1003/files/25649924059.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/42356771426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/povumad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/6922445239.pdf
    • https://cdn.shopify.com/s/files/1/0452/3291/4592/files/compton_effect_engineering_physics.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/kedujajawefuniminiw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0528/files/resereraper.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_off00006be8.bin
0743fb48b419bd9f4fc296bdf18ac27f5d05addcf9cb90a7eb2d462089aa67b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE8 5436 bytes
font_01_sfnt_off00007e4f.bin
59de30d0b678f88491a0dc7af34c67f27aabde932f6b94d00c9e9ff230193095
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4F 14392 bytes
font_02_sfnt_off0000ab48.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB48 4324 bytes