Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9de7b938fd1bf…

MALICIOUS

PDF

36.2 KB Created: 2020-09-01 11:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2010b2e0a787e9d2c410b52223c08010 SHA-1: 4a194852a795acfeee885ca8bb4aadab9a201bf4 SHA-256: 23f9de7b938fd1bf06c6241b846cf185dac3e6878eed2de2ec21a5eee393097e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to templates and includes the malicious URL. This suggests the document is designed to trick users into visiting a malicious site, likely for phishing or to download further malware. No scripts were extracted, limiting the analysis of specific execution behaviors.

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/wix?keyword=plastic+hexagon+templates+for+english+paper+piecing
    • https://static.usrfiles.com/ugd/4117a9_8907284de8e047048d3fc12f98b9531a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb192fea79f455997aa342fe78ed78c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d160ce30a08f43b8a5703c44dd9143de.pdf
    • https://static.usrfiles.com/ugd/b8c837_5defc467423642cb83b87c30d353fdb4.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/honeywell_6000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/1114/3842/files/english_language_comprehension_test.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/1402213257.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/yahoo_weather_in_atlanta_ga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/xukone.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/92134636034.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/dark_souls_dragon_greatsword.pdf
    • https://cdn.shopify.com/s/files/1/0430/3739/3049/files/60309594408.pdf
    • https://cdn.shopify.com/s/files/1/0434/5721/6669/files/43315565576.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/towidorisijunakumof.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_off00004d5b.bin
fa152457c4f58f1f3978eb2a8325451bf173a40717193e7e3850c41a4ba90e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5B 5496 bytes
font_01_sfnt_off00005fef.bin
d2c261ef1d94774c6ea66e6464ffea2ec2518b6c011aebfbaf99c98ce365072c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 10456 bytes