Malicious PDF — malware analysis report

Static analysis result for SHA-256 8221d50fad27f06d…

MALICIOUS

PDF

45.4 KB Created: 2020-07-28 15:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2ab7ffd7300fe959c8d4ab9cfc93f0 SHA-1: 816e4218661692bfefe795b54395a6828cddb2c4 SHA-256: 8221d50fad27f06de8aa121c3ed637e30e31b518ccc8d8089adbbc2b9f4c04c7
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'conquer maths answers', suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness.

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=conquer+maths+answers+p6
    • http://files.shannondrhodes.com/uploads/1/3/0/8/130873907/1944747.pdf
    • http://files.afsfabillierenfroe.com/uploads/1/3/1/3/131380177/83533.pdf
    • http://files.theclassicalacademy.co/uploads/1/3/2/8/132815791/9543073.pdf
    • http://files.toothnscale.com/uploads/1/3/2/7/132740747/346fa.pdf
    • http://files.shannondrhodes.com/uploads/1/3/0/8/130873
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/26506849752.pdf
    • https://cdn.shopify.com/s/files/1/0433/3898/9718/files/povezudokif.pdf
    • https://cdn.shopify.com/s/files/1/0431/3756/4823/files/kimojipotuzew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6412/files/kanobolikaxowag.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/2511762668.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9607/files/tudeborinosizogub.pdf
    • https://cdn.shopify.com/s/files/1/0430/1638/8761/files/30538412132.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/56420031974.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/ruxifozitos.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/48196638534.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/85226948358.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_off00006921.bin
8f78e4263c740abc4318f13ccc4296caa39bd378b0e1514ebb538658cf2280e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6921 5256 bytes
font_01_sfnt_off00007ada.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADA 1800 bytes
font_02_sfnt_off00008368.bin
c9759943cb83f0c78e4a31caade33483d69f9a28a286aa23da88d3a3b745cbc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8368 10844 bytes