Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7575244d2a27724…

MALICIOUS

PDF

69.3 KB Created: 2020-08-04 11:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec5d88e2554ce65b69f1027da27365e SHA-1: a2664dc767c5caf671075f7eb3dbe238bb9cf4d6 SHA-256: c7575244d2a27724c101b7969eaf6623dfaa5e5c972b81d930a573aeeccf0ed6
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, which is indicative of an SEO link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the ultimate destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=best+reader+for+pdf+ipad', suggesting a lure related to PDF readers. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=best+reader+for+pdf+ipad
    • http://files.dappsinfintech.com/uploads/1/3/0/9/130969265/cca6a.pdf
    • http://files.abigailgallagherportfolio.org/uploads/1/3/1/4/131406610/b5ce0.pdf
    • http://files.faithwesleyan.org/uploads/1/3/0/8/130814907/3960876.pdf
    • http://kozagi.buttonsnmoore.ca/uploads/1/3/0/9/130969440/96d3693ded5f931.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/todilaxutixipotuzi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/33283914237.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/dabok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/pepefosowit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/96163651315.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/68374368995.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9606/files/balkans_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/xuxakijulosokivuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22271122494.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/lead_acid_battery_msds.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff4.bin
1e46b728f0b7d39d6745556c7aced79b896d240f559be1711278374be4c23eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 4732 bytes
font_01_sfnt_off0000c01e.bin
115cedf770f75e0dc4c4c217917d6b0f52a6391f1eca2e86373a1ed1e4badca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 10652 bytes
font_02_sfnt_off0000e4ba.bin
bc11e6e2a4e6cab58553da7a5ecc52a1c6cdf2c6c75145df4fcdedc17b8281c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16108 bytes
font_03_sfnt_off0000f98a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 4324 bytes

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