Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f133bc349d5b1d9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-08 13:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1373ee137c3a24994f93c99d22e0517f SHA-1: 93cbb64cf798f7993667f51f622229bd8d921440 SHA-256: 7f133bc349d5b1d9c15641647a0e236ae1cb359f2cc4ad659d87da4bc917351d
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One of the embedded URLs, https://ttraff.cc/wb?keyword=el%20modernismo%20y%20el%20posmodernismo%20pdf, is identified as a known malicious redirector. The presence of this malicious link, combined with the link farm strategy, indicates a high likelihood of malicious intent, likely to redirect users to phishing or malware distribution sites.

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/wb?keyword=el%20modernismo%20y%20el%20posmodernismo%20pdf
    • http://files.dmillsphotography.com/uploads/1/3/1/8/131856725/pibup.pdf
    • http://files.mosquitosaregone.com/uploads/1/3/1/4/131437378/3161943.pdf
    • http://files.tanlaagoura.com/uploads/1/3/0/8/130873983/2324736.pdf
    • http://sebalej.annranderaadpottery.com/uploads/1/3/0/7/130776031/rifelodutofovowuxiko.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/jilimupawanebojagatujumuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4618/3847/files/13199447708.pdf
    • https://cdn.shopify.com/s/files/1/0447/9169/3463/files/amidah_18_bendiciones.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/tulozabujitilufetoduvaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/46810635074.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2840/files/bifurcation_stenting_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/bilurep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/39642413436.pdf
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/68086652017.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/bunamujamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/discord_chrome_no_sound.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/kotefizatazofewuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/57939168736.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_off00006728.bin
cef66949eeee8bc3cc41562c4ed6e6bd2ad4932af3b66adf9dd84a8ada674d16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 5036 bytes
font_01_sfnt_off0000783f.bin
a7790cf8708e79789eabe3fadcce9e6922cd466d0a809173c7f1fa3ffbe9dd9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783F 10652 bytes

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