Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b190c6be0b1ac1b…

MALICIOUS

PDF

55.1 KB Created: 2020-08-02 17:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0da3b81a9194e007c14e6e0a7ed46b20 SHA-1: 0a98e612ae9b967ce585655cfe80fc971d35b40c SHA-256: 9b190c6be0b1ac1b90d304336fad0208b6d0e4fafd4ee9f03f9ac41a17fbc19d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=house+made+of+dawn+pdf', which is a known malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=house+made+of+dawn+pdf
    • http://files.speakerthoughts.com/uploads/1/3/2/6/132681824/fe5c1.pdf
    • http://files.medgaming.com/uploads/1/3/1/1/131163902/9786805.pdf
    • http://files.annamariekurtz.com/uploads/1/3/1/6/131637374/5413081.pdf
    • http://files.plantgrowthchambers.com/uploads/1/3/2/6/132682802/miximalapufolegigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7057/files/xubenoragobuwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/83343525645.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/58393847959.pdf
    • https://cdn.shopify.com/s/files/1/0434/5387/4329/files/47972952293.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/nabewajuliwumasava.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/kasonomizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/pusuresegozubilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/76147913337.pdf
    • https://cdn.shopify.com/s/files/1/0430/2284/4067/files/kavaxamukus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/kofomubogajat.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/depeche_mode_greatest_hits.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7918/files/sanyo_dvd_recorder_vcr_combo_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tijubijevuvikupox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e8f.bin
61c3fdd8b9e9ee6810634c2451a4391d902c5dee5024697a0b201c55a7b250c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8F 4868 bytes
font_01_sfnt_off00009f0b.bin
dc8b753c16ab97d301d935197db854cd06c5b8da67d2da45ac03374b0b3a5b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0B 9904 bytes
font_02_sfnt_off0000c0e5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E5 4324 bytes

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