Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f41c283eb2b0d3…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 17:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bd42bae355b4c3b71b0e1a3d374894c SHA-1: b6afb948cc5005ba32bb7f7e9e4f3e1d3a60bb33 SHA-256: 61f41c283eb2b0d3a5ecea3f2a2db2a5ebab318fd0b3d58ade8a1f9f90941006
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 a redirector service. The document body, though heavily obfuscated, contains a URL that also leads to this redirector. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

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=excel+sheet+guide+pdf
    • http://jawerosa.daretobesuccessful.com/uploads/1/3/0/7/130776433/a4ff9f7509c0480.pdf
    • http://files.wickedladiesbeeco.com/uploads/1/3/1/6/131607467/9855123.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/8149818928.pdf
    • https://cdn.shopify.com/s/files/1/0449/1545/8215/files/free_lightweight_reader_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/35072634963.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/87788147759.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/liwenek.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/lutekanibujifiwetotavudon.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/ratesigu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/zupapezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/what_are_christian_values.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/vexigenotumadulowofebitef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/kipisugutitadotena.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/ctet_july_2020_paper_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/35632814905.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_off0000604f.bin
7c05e891bfb6608d65fa0020a7fc9a0f3d5efc52a39ea3a4b20e1db206988abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 4804 bytes
font_01_sfnt_off000070c3.bin
fe03af8c360e152188c18b1e185126dc3dc5f867ac582490947a1ab3c70a0443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C3 10096 bytes
font_02_sfnt_off0000934a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 4324 bytes

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