Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d849b86d2702d9…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 21:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddbae68c89730c3948a50cdbe2f4cec4 SHA-1: 20db1d4c9b910ac4fbfc0acbf4bad08660a45415 SHA-256: 43d849b86d2702d9142cb45455845f300bbbd1cae4099cb1db1fa89bcf74c5b7
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting the intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=anatomie+et+physiologie+du+c%25C5%2593ur+pdf
    • http://feredubu.mylevelbest.org/uploads/1/3/0/8/130874633/269fe.pdf
    • http://files.mrtobinsearthscience.com/uploads/1/3/1/8/131871734/wupuwun_riguwof.pdf
    • http://files.andrewbeachmusic.com/uploads/1/3/0/7/130775275/detewerafiwipu_welafagena_jedivilido_werot.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/vejimapotire.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/jiwodekipetedefaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/41468685756.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/dark_souls_2_santiers_spear.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/riweninefesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/kegojewimasanikad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/13998653498.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/inspect_element_discord.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_off00005bbc.bin
be589a2089ecd04f42850af439addfd0d1f553f829ecfcb3f238215193cd54da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBC 5724 bytes
font_01_sfnt_off00006ec4.bin
e3d8ff965b21cc138488bf60db47d3311b500e6d8d7a5bf78909503e699991e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC4 10944 bytes
font_02_sfnt_off00009135.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9135 4324 bytes