Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c507d9f0d3b248c…

MALICIOUS

PDF

83.4 KB Created: 2020-08-05 07:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7e532906abb501402e73c0a84dd911 SHA-1: c1e7cef5c4c1c0a7ecb2ea9e6a8fea93b7e6de54 SHA-256: 6c507d9f0d3b248c48620ccb169ca16305380d59a884886054f25df698bcee13
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external websites, with one identified as a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, includes a URL that appears to be part of a link farm designed to distribute other PDFs. The ML classifier strongly indicates maliciousness, supporting the attack pattern of luring users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=violencia+en+el+ambito+laboral+pdf
    • http://files.greateragapedeliveranceinternationalchurchinc.org/uploads/1/3/2/7/132710783/2119179.pdf
    • http://files.nathanrgeorge.com/uploads/1/3/1/4/131409309/vovanurowiwe_sefevel_wubogaman_tokuzanox.pdf
    • http://files.alfredofatale.com/uploads/1/3/2/3/132302993/1286888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/36046466923.pdf
    • https://cdn.shopify.com/s/files/1/0429/9997/1999/files/xowamib.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4283/files/50688655068.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/exemple_de_cahier_des_charges_d_un_produit.pdf
    • https://cdn.shopify.com/s/files/1/0436/4845/0718/files/paris_ratp_bus_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/daxiwazitonowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/65668138190.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/3184822568.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8167/files/81100859661.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/63653402579.pdf
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/lamagotipapaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/tepenigoxaletofudorudik.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91a.bin
03945869508c1d027c8beb87498283c4035eddfb4745cea8b6242c19ed3cd3eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 5016 bytes
font_01_sfnt_off000109fe.bin
48c777a8db952c5eae478dab68a95468d94d03792ea05317c8304da7093de794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 11684 bytes
font_02_sfnt_off00012ff1.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF1 4324 bytes

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