Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5f1d5462306a4b…

MALICIOUS

PDF

45.9 KB Created: 2020-08-08 15:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2beb0bbf4344b3974b385f9dec1e9a94 SHA-1: 774652cd4165198ba54137da67040d816271217f SHA-256: de5f1d5462306a4b3bea1d0851f27f05f96ef8d31ffaced57415f14258ccfb3a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=tongue+thrust+exercises+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure under the guise of providing a PDF. The ML classifier strongly supports the malicious nature of this document.

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.com/pify?keyword=tongue+thrust+exercises+pdf
    • http://files.prospectdems.org/uploads/1/3/1/4/131407877/jodamajabimetu.pdf
    • http://files.kongsandseib.com/uploads/1/3/0/7/130740536/648689e.pdf
    • http://files.petportraitsbyjen.com/uploads/1/3/0/9/130968993/3269997.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/the_cantin_ketogenic_diet_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/cognitive_archaeology.pdf
    • https://cdn.shopify.com/s/files/1/0434/0600/0282/files/zopineboxavajidovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3073/files/7445187415.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/kowufivopuwonirakekuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/51941049352.pdf
    • https://cdn.shopify.com/s/files/1/0432/7007/8617/files/biblia_kolbrin_romana.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/vozasuletage.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/80152179633.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/fasafizelanuvukufiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/difaxoji.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_off00006d6d.bin
059c78708c2f0fbd11e98835746d8ffa2ecfb73d7cfc547f158f2103d9b2e71a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 5192 bytes
font_01_sfnt_off00007f23.bin
785baf35f57572f4a8e721b9bf808ce844d2e4d781ddf9eb78a54f187c74bcde
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F23 13864 bytes