Malicious PDF — malware analysis report

Static analysis result for SHA-256 6befafc5a35654b8…

MALICIOUS

PDF

48.8 KB Created: 2020-07-29 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4004f6bd8ae09c70835e5d84fd83a344 SHA-1: 72cf73027922bf72d064d42cd05bddcbdfdae23e SHA-256: 6befafc5a35654b8c3d4e702f273fb20eb8f73dc920c1d39cb14e9e40dfa5886
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and heuristics suggest an attempt to create a link farm for SEO poisoning, directing users to potentially malicious or unwanted content. The ML classifier also strongly indicated maliciousness.

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=practical+boiler+water+treatment+handbook+pdf+free+download
    • http://files.tri-starglove.com/uploads/1/3/2/7/132740693/1234509.pdf
    • http://files.oliviaclareboutique.com/uploads/1/3/0/9/130969433/zojonorazoka.pdf
    • http://files.vanaudelanalytix.com/uploads/1/3/1/8/131856306/wuxagezivajopo-foxipi.pdf
    • http://files.advancedanaerobics.com/uploads/1/3/1/4/131406412/38a59cc20e.pdf
    • http://files.asnapoftime.com/uploads/1/3/1/8/131856186/dakulutivedusaximo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8534/8510/files/86142195354.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/nopupuludi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/fumoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/bazulon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7815/6449/files/pedibubisa.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/58522863475.pdf
    • https://cdn.shopify.com/s/files/1/0430/7179/9449/files/96897219458.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/gigositukazumem.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/52601725864.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/xuvometopojuga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.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_off000069bf.bin
ca98d607db2cedaeb34b57e61b36fa0cdc1557d79520c5d1033f8e7490729aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 5304 bytes
font_01_sfnt_off00007b8a.bin
3d710a4b121cc3492c3eb33a949758d423697a96dc6070b99fa40abea3aa876d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 2116 bytes
font_02_sfnt_off00008556.bin
c9eacb1881b9dc271c0a302615a89ff1e51967ba3a194b96f4a1012c88a5053b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8556 15244 bytes

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