Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69a0a59f2bf1dc4…

MALICIOUS

PDF

42.8 KB Created: 2020-07-30 20:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc0731f1ee13764a1808f6264a2d8464 SHA-1: 5f94451e8e01c144f473231f37a11e7469b9c9c2 SHA-256: a69a0a59f2bf1dc4dbf221117159e130b96192d4808612968f788776f2cd3b2b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, appears to be related to the link's keyword, suggesting a lure. The primary attack pattern involves redirecting users through the identified malicious link to a potentially harmful destination.

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=simple+present+tense+affirmative+negative+and+interrogative+pdf
    • http://files.samgevers.com/uploads/1/3/0/7/130775515/luxegokapiru-lijoso-woferininuzuzes-fitowesifumel.pdf
    • http://files.mdofirstrosenberg.org/uploads/1/3/0/8/130874672/fuleguf_vubefuxitazavi.pdf
    • http://files.backinactionchiropractic.com/uploads/1/3/0/7/130776253/58a8c8c4d7c1c52.pdf
    • http://files.lunchsalon.com/uploads/1/3/2/6/132683328/jagujez.pdf
    • http://files.backinactionchiropractic.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/kifow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/teruzumanasarogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7147/files/jifeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/momitejamijen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/lanurek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/kamegit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/74714086890.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/gidefosakir.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/73090648929.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/17093845224.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/gaxive.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006589.bin
cbc8e1c6fad8b330ddd14f3760925478ea5a1ffa172cc1fb4e325d7176b708a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6589 5312 bytes
font_01_sfnt_off00007777.bin
a309b232f206210195b34cac8ee40d536e658f4219986be159dbc7973e286eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7777 10452 bytes

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