Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d4e1832234b029…

MALICIOUS

PDF

41.7 KB Created: 2020-08-02 05:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc019ae549ce6079907c9f87efd10514 SHA-1: 672e1333928fb9e1dcea5dd38b823dfbc81fcb5f SHA-256: f8d4e1832234b029945075077c0441bd0e94291b9b5bb93af5e369769c23d94d
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=flashlight+on+iphone', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and a large number of other embedded PDF links, indicating a link farm designed to distribute malicious content.

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=flashlight+on+iphone
    • http://files.beheadstrong.org/uploads/1/3/0/9/130969897/bojepulubirutogo.pdf
    • http://files.awordandcompany.com/uploads/1/3/0/8/130874284/5972053.pdf
    • http://files.truurelief.com/uploads/1/3/0/7/130739559/sisufibim-wapuxaxuwu.pdf
    • http://files.sixwhitehorses.info/uploads/1/3/0/9/130970004/d860c6.pdf
    • http://files.tncommunitycorrections.org/uploads/1/3/0/8/130814397/nipedeg_vuwatase_pikubaka_juwudisu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/59544618188.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/wexuxagureganamegufaviro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/wuvejosokibuzizufasuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/kilixogimutabemef.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/43032835601.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2159/files/91229921118.pdf
    • https://cdn.shopify.com/s/files/1/0434/0196/9820/files/tegepowilobezef.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/pufafut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/1723905213.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/61679720847.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_off00006672.bin
9e45a3eb4c28b8bc79a8b403a6b763bc435c6a5401be0e6b9c0604b86bec9708
pdf-font-stream PDF embedded font (sfnt) at offset 0x6672 4940 bytes
font_01_sfnt_off00007744.bin
a9bc9b96e90743564cf58e5666415e1d50f7079571cf4f7d8d53208c0a2242d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7744 10084 bytes