Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3d1fa43c0961a3…

MALICIOUS

PDF

47.8 KB Created: 2020-08-05 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfe664a929fd412b969672ec653861a3 SHA-1: 71bc5cb9f9296c97bd951cd58baa0b8c6440cb01 SHA-256: de3d1fa43c0961a3ffa915df7a739a75fc4f8caf77293f37dd0a093347afa640
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a specific malicious redirector URL, 'https://ttraff.cc/pify?keyword=clases+de+ingles+avanzado+pdf', which is designed to lure users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a SEO-based distribution tactic. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.cc/pify?keyword=clases+de+ingles+avanzado+pdf
    • http://files.hivekitchenstore.com/uploads/1/3/1/6/131606248/7826733.pdf
    • http://files.lisaorrart.com/uploads/1/3/0/7/130739918/9250629.pdf
    • http://files.shopbrickroad.com/uploads/1/3/1/4/131437625/9065848.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/wotazesokuvitadopofikud.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/chemical_kinetics_class_12_cbse_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6439/2866/files/18963001065.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/jefuruduretedamoname.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/nolajoduwusikup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/19664213956.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/workkeys_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/60726767197.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/43808475153.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0215/files/kent_county_inmate_search.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_off00005d37.bin
e637e929042e3978bec96b31b3490ba660419ed310d31d627162007a830036f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D37 6424 bytes
font_01_sfnt_off00006d18.bin
ac2daeb1248104da1d9bbe8c62b0b3d7deab6dc84428de724644da26e386d44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D18 4956 bytes
font_02_sfnt_off00007e11.bin
b520c4961f27bee721fbf1a52fd1d83c822e1b78863ca9c929883ba182d69d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E11 11164 bytes
font_03_sfnt_off0000a260.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA260 4324 bytes

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