Malicious PDF — malware analysis report

Static analysis result for SHA-256 d488788a5d44b8f8…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 00:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212cd6e0e507ea19f2a78286303f1b6b SHA-1: 24b0603d78a0dd7ecf22533efd3be191f6ea0572 SHA-256: d488788a5d44b8f8ff27afaa3e5e7cfb2b7d8972558dbaa3bb62771b3bde6fcd
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about manufacturing processes. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further stages of the attack. The document body itself is heavily obfuscated and contains embedded URLs, but the primary lure appears to be the malicious link.

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/pify?keyword=plastic+bottle+manufacturing+process+flow+chart+pdf
    • http://files.laurenkorshakmft.com/uploads/1/3/1/4/131453136/zipuvesutorikiwu.pdf
    • http://files.missmurphyscience.com/uploads/1/3/1/6/131637055/lukov-xivawaxevem-zulabiduvuruj-gukusopajari.pdf
    • http://files.diaryoffaith.com/uploads/1/3/1/3/131398076/2556243.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/87158063813.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/zapelakeboxarojasakemofa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/26413673860.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3643/files/79220194845.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/pimenetoxabivorojidupot.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/minecraft_semi_vanilla_servers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/4424393811.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/63577755714.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/architecturally_exposed_structural_steel_specifications_connections_details.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44411244229.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/29127540373.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1700/files/76603191386.pdf
    • https://cdn.shopify.com/s/files/1/0438/8601/8712/files/dns_server_might_be_unavailable.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_off00006b11.bin
ba4638cd4932116b747844e78c315d4319279e5839a9ea171a3eaf2ed8a6e142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B11 5800 bytes
font_01_sfnt_off00007eb4.bin
e399068bda1de3a8c11d2c941c5f17309ae01973887aec11a365d973166c9be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 10004 bytes

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