Malicious PDF — malware analysis report

Static analysis result for SHA-256 84455be4673931a3…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 16:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c3de90e071172b4f6e77df20819425 SHA-1: 17dac69d284ae347006521d5d8c6f94bbf61a08d SHA-256: 84455be4673931a3277de87221c4dfcbaac0fed1fa20384720bda0f2869e7b5a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links redirects to a known malicious domain, indicating a phishing or redirection 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.ru/pify?keyword=balanced+literacy+framework+pdf
    • http://files.usafortunae.com/uploads/1/3/1/8/131856584/liwifejebiv-xojakaxebopanej-wijilimiw.pdf
    • http://files.gaiatreeshala.com/uploads/1/3/1/4/131437873/fafakif.pdf
    • http://zaxiru.noparameters.org/uploads/1/3/1/4/131438405/9d0b94025ddd.pdf
    • http://files.stitchingfitchic.com/uploads/1/3/2/8/132815343/3841316.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/veloxolak.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4101/files/computer_concepts_2016_comprehensive.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/fobevifagopema.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7095/files/xapalufanikivexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/jibumakovifatowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/14037933634.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/32495214969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76410179135.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/64657162706.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_off00006c7b.bin
c0fab3bedd4f59cfb6b936fd321234bb00c125f7163ca2f09e5fdff1783fb624
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 5428 bytes
font_01_sfnt_off00007efb.bin
73f9886fe5a819d23212d535babc8ba638f69bb1a91582941e0dc2c732236030
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFB 10276 bytes