Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ae402767c9c774…

MALICIOUS

PDF

69.9 KB Created: 2020-08-16 00:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 198248a43c9b8da0eb6799f06ac5bd65 SHA-1: 307bacbc67aab1d37aa31f1c9e158b2208694c5d SHA-256: 38ae402767c9c7746a7aff9a7d641877a1aaa976a82a3cebf933bbe9907ea2e0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is presented as a search result for 'Acido formico nombre iupac'. The document body, though heavily obfuscated, also contains this URL. The PDF also hosts a large number of links to other PDFs on Shopify domains, likely as part of a link farm to improve SEO for 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.ru/pify?keyword=acido+formico+nombre+iupac
    • http://kasub.codeblaque.com/uploads/1/3/2/6/132682892/5bd2f79.pdf
    • http://files.cullensailworks.com/uploads/1/3/2/3/132303382/e2c87e042836.pdf
    • http://fexajem.mosaicchurch.org.uk/uploads/1/3/2/8/132814930/varuxo_zudadef_zadopuson.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/8125585297.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/rebimudofis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/11109020290.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/nokukafesewedetapulinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/41087937789.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/65012444340.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/mazapemos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/wings_of_fire_book_12_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/prey_neuromod_fabrication.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2044/files/vovibirufigojaxewidexuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/33366355256.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/samples_of_abstracts_in_apa_format.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/
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7db.bin
b9c1bd2281f23f09d905494077011cda678d8ff8a20e62f41a46584ce81a564d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DB 6492 bytes
font_01_sfnt_off0000c810.bin
3c89ed774966df94897986015b13e859a0ba1b546822e7485ed61da488708793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 5220 bytes
font_02_sfnt_off0000d9aa.bin
43d3d830ec5f4e2593e52f93d4857106e05f6b7329815f4e84efd3086c65e0c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 15196 bytes

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