Malicious PDF — malware analysis report

Static analysis result for SHA-256 838b1407fcf66711…

MALICIOUS

PDF

36.9 KB Created: 2020-08-23 22:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9380e1fab281e19cca3b4e9b44c01a85 SHA-1: aa4f1341ce7a38d0686e247e0bd45115a8143d67 SHA-256: 838b1407fcf667116ddbd3ffc89c3d6df53809378fab131861fa4a883f05db4d
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, with one specifically identified as a malicious redirector. The presence of numerous links to external PDFs suggests an attempt to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the heuristic firings strongly indicate malicious intent related to link manipulation and 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=aashiqui+2+song+lyrics
    • http://files.martindewittfinearts.com/uploads/1/3/1/8/131856158/kememadosozimod-pisofotizu-mezedefob-defepiliso.pdf
    • http://files.biodanzausa.com/uploads/1/3/1/1/131164295/b23902bd5dbdb2.pdf
    • http://files.kenyawebnews.co.uk/uploads/1/3/1/4/131406840/b0111a4b3e8.pdf
    • http://sepetepi.balcotthighvintage.com/uploads/1/3/0/9/130969536/4321844.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/apa_citation_format_example_in_text.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/kesajawojoxezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9122/0887/files/18081095203.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/2875249738.pdf
    • https://cdn.shopify.com/s/files/1/0432/4481/4500/files/paninoxufuwupopunan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/how_to_see_archived_messages_on_messenger.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5910/files/blessings_laura_story_piano.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052e5.bin
91bcb66868f5cf84711a9604797b8427a1bae1472f5479717b8b04ab79a84acd
pdf-font-stream PDF embedded font (sfnt) at offset 0x52E5 5412 bytes
font_01_sfnt_off00006544.bin
e95c01a0abbb6863116ef9509cc930fa4fb2e25ab1ac33af1c632b32daf56393
pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 9980 bytes