Malicious PDF — malware analysis report

Static analysis result for SHA-256 e484a6bdbaecc3c4…

MALICIOUS

PDF

35.8 KB Created: 2020-09-01 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e263164e58fd54116e73ce590f8f93ab SHA-1: 8c18e76a845896c96afa1daf7e4a543c74222df5 SHA-256: e484a6bdbaecc3c4fa9f665a72da60dadafb87316a44fbc989ef100505fe2acb
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Continents of the world map worksheet' and the malicious URL, suggesting a lure for a phishing or malware distribution campaign. 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.ru/wix?keyword=continents+of+the+world+map+worksheet
    • https://static.usrfiles.com/ugd/d4a9d6_9569d7e1645a4e719272c3dc07af88ce.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_2a4066263c714f0f8c8467e88ac739cf.pdf
    • https://static.usrfiles.com/ugd/38eac1_1b270c83ef1b41cb9a1df69d11d0ce6b.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/32051125884.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/30832262435.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2391/files/77510174187.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/galactic_civilizations_3_crusade_guide_fr.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/besezulowizujijef.pdf
    • https://static.usrfiles.com/ugd/ca300b_3406868fc0df4ac2bd4fece78ddc6a5a.pdf
    • https://static.usrfiles.com/ugd/51c472_6a143ddd2ab54fa1a8c542c25b53237b.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/fundamentals_of_matrix_computations.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/40895075940.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/osborn_diagnostic_cerebral_angiography.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/suzukewuzatewonolipu.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_off00004ed6.bin
adb9132534b7255fd62fb611112ab9b20b895e77698d5c2870ca7f394b888c00
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED6 5344 bytes
font_01_sfnt_off000060e1.bin
a33e5ceadd3a8eb5ef58c79c30e193286008003a9438f1364aedce81dff4e714
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 9824 bytes