Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b608ff52d3b4b97…

MALICIOUS

PDF

56.9 KB Created: 2020-08-08 17:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389410a5791e8c1af4b63a39d29b9cb4 SHA-1: 6b9a36ce64e3d92e98b8fd5d5e1e732c5e18f3b3 SHA-256: 2b608ff52d3b4b978df8adc9caf3cda5d1d7cebbcbc77be0eabb6c9e4f589383
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains a string that appears to be a file name ('dreamweaver cc 2020. pdf') and the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning technique to distribute malicious content. 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.cc/pify?keyword=%25E0%25B8%2584%25E0%25B8%25B9%25E0%25B9%2588%25E0%25B8%25A1%25E0%25B8%25B7%25E0%25B8%25AD+dreamweaver+cc+2020.+pdf
    • http://files.fertilemoonmidwifery.com/uploads/1/3/1/6/131637136/20cf16e33.pdf
    • http://files.marysclosetco.com/uploads/1/3/1/3/131379406/61b736.pdf
    • http://files.kidsfunreads.com/uploads/1/3/0/7/130775516/kedukulodazoxu-xinefexupezi-varaxifusoli-sagewaluka.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/ganejefi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/arjun_award_2020_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9321/files/zimojubivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/mobaxipilulesifupebuva.pdf
    • https://cdn.shopify.com/s/files/1/0437/8578/1405/files/luzejolusitilelefuzof.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/niluzunuriwosufiluxef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/matatadul.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/30680180977.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/38708064822.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/dovolavinuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000895c.bin
c604d4370ea60a81670a73bc0d312117e4879317d3bc6e190ae6c6b3d6f804ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x895C 13904 bytes
font_00_sfnt_off0000657a.bin
67ee9ebbee16bd03df285e11a94e26d1122ef40541ece0c89e196027b80499dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 5452 bytes
font_01_sfnt_off00007805.bin
fdcea428224d05f3763431907873e6755001c22d7c641cfe9d5fc03a5b0f1627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 6544 bytes
font_03_sfnt_off0000b034.bin
689992c5f3599b92e555755adfa1a8c5b93b2c2dc22fed67917cee9a25450277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 10460 bytes

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