Malicious PDF — malware analysis report

Static analysis result for SHA-256 16072c0e56243674…

MALICIOUS

PDF

50.8 KB Created: 2020-08-08 14:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db766e7d0d8f53a100ce18d2dc9ef9e SHA-1: d67947c6be5dc25e5b5132b0291cd90ad9315636 SHA-256: 16072c0e56243674f42397a2c0088515a5eb4c52bf1af3ed12005b78546d413b
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=er%25C3%25B6rterung+schreiben+beispiel+pdf', indicating a phishing or malicious content delivery attempt. 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=er%25C3%25B6rterung+schreiben+beispiel+pdf
    • http://ruwalupop.juliehui.co/uploads/1/3/1/3/131383544/pupabopu_jamozuburukuzav_gavipizuminajut_metagewet.pdf
    • http://redilak.nestnewhomes.com/uploads/1/3/1/3/131380429/12be26a7d54.pdf
    • http://files.fountaincityfc.com/uploads/1/3/1/1/131164174/ginivedepexodojebu.pdf
    • http://files.beautiquestyles.com/uploads/1/3/1/4/131407102/miparinegedo.pdf
    • http://files.omahabeadaffair.com/uploads/1/3/0/7/130776661/pegobug_vawareniwu_xevab_votev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/36198274356.pdf
    • https://cdn.shopify.com/s/files/1/0440/1656/6422/files/76361999175.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/sadojugima.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/lodafotufufomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/tufikowodorufojigeve.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/electronegativity_and_bond_polarity.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/antigen_retrieval_methods.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8601/files/11097635266.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/jofedofoxavaw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007139.bin
7ab0751887f07f27df97fd74e5c2942e722ff5ae742a8ff5b15eca326a5def60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7139 5440 bytes
font_01_sfnt_off0000837a.bin
8a8603259c78cb08849daa309f37ba95376ffa3776980a2a56841c166ad6d80f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837A 10628 bytes
font_02_sfnt_off0000a667.bin
51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA667 16148 bytes

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