Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e1f8d55fdfe0b7…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 09:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa1d99c47ec829c0ecca3a58e1f3968 SHA-1: cca7e40b319d3efc0ab34e32a42fa8d4b5e62b20 SHA-256: d1e1f8d55fdfe0b713a66549fdf1c40433955bfa5f966ad860eac09b5e1414ec
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=atropina+farmacologia+pdf, reinforcing the malicious redirector finding. The ML classifier also strongly flagged this PDF as malicious.

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=atropina+farmacologia+pdf
    • http://pirexevix.castropavingconstruction.com/uploads/1/3/1/4/131482995/8484394.pdf
    • http://files.solutions-ink.com/uploads/1/3/0/7/130739892/xuwisefuve.pdf
    • http://files.jerkngo-olympiafields.com/uploads/1/3/1/4/131453124/31105e002c.pdf
    • http://files.researchdesigndoctor.com/uploads/1/3/1/1/131164112/31287801494cdc3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0434/7563/2285/files/62905414334.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56317886700.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1145/files/98519681864.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/repugonipirodunekevagepob.pdf
    • https://cdn.shopify.com/s/files/1/0438/3752/2082/files/19628539883.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/sugomugepemalom.pdf
    • https://cdn.shopify.com/s/files/1/0436/9966/7099/files/35644282203.pdf
    • https://cdn.shopify.com/s/files/1/0437/6277/8264/files/pathfinder_2e_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/detexodime.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0432/4212/7527/files/93799079257.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.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_off00006962.bin
5d6787e6e111e35c2f25a41e59e59e8ecbc9c63199dc0cb785924314389d60b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6962 5284 bytes
font_01_sfnt_off00007b46.bin
9897453afb8354739e14fcc859893ac3bf7a34ee2ba8985978f604992977a080		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B46 10336 bytes

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