Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f145bfcc4925078…

MALICIOUS

PDF

46.2 KB Created: 2020-08-20 01:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41c6e16b50cb06363450b891bf49c66b SHA-1: b8e6be257566b6a28b127b88425a1543b34d3ef9 SHA-256: 5f145bfcc4925078fa38bd2eda3d16772ee968323da4c805523e5defa5c95eab
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. Notably, one link directs to a known malicious redirector infrastructure, and another points to a URL that appears to be part of a link farm designed to host numerous PDF files. The document body contains text that seems to be a lure, 'Bhakti picture hd', and the presence of multiple PDF links suggests an attempt to direct the user to malicious content or further stages of an attack. The ML classifier also strongly indicated maliciousness.

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=bhakti+picture+hd
    • http://wimixofi.marthaannepalmer.com/uploads/1/3/0/8/130874493/zavobodewawezad.pdf
    • http://files.nanosystems1.com/uploads/1/3/1/4/131408103/712e1beb833f.pdf
    • http://niwatom.spiritualandparanormalconnections.com/uploads/1/3/2/7/132740541/6695746.pdf
    • http://files.acadianacarpetbinding.com/uploads/1/3/1/4/131483662/810062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4384/0412/files/62881862282.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/android_gba_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0437/3911/9765/files/google_sheets_query_order_by_date.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xomekanob.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/kududezew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/48910286252.pdf
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/bijeridi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7114/files/sifatuxoluletasuridizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/biological_science_freeman_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/pulupifoxitabudob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/meveme.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/10208513384.pdf
    • https://cdn.shopify.com/s/files/1/0440/6607/8870/files/muwizedirukovut.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/kicking_horse_snow_report.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_off000062fb.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FB 2952 bytes
font_01_sfnt_off00006d89.bin
26d33f7b2cc3733ed5d7ce7fec989cc6658a91004e3267d4cca23989b87c8222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D89 5064 bytes
font_02_sfnt_off00007eb6.bin
3dcc30fb301a15e1ed2ffa27dfb6907748b269ee809d69b2660973d579e51f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB6 14484 bytes

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