Malicious PDF — malware analysis report

Static analysis result for SHA-256 baad52f4f6a67d07…

MALICIOUS

PDF

52.7 KB Created: 2020-08-13 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f59a3838154103331e98a78902053ecb SHA-1: 45c05e71ba0e25b31d6b1682d9fadd1ebdcc2544 SHA-256: baad52f4f6a67d07e315206ed5beb191d837eada3c1773ebe4d0a0dec1064c6c
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, with one pointing to a known malicious redirector. The document body contains text related to a 'Brother printer dcp t500w', suggesting a lure for potential buyers or users seeking support. The primary malicious activity appears to be the redirection of users to external, potentially harmful, websites through the numerous links.

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=brother+printer+dcp+t500w
    • http://files.joanosato.org/uploads/1/3/1/1/131163943/xarusagoso.pdf
    • http://files.cantsitstill.net/uploads/1/3/1/6/131636807/mimumixujijuvil.pdf
    • http://sosovusej.mfmetalarts.com/uploads/1/3/1/0/131070450/aef5a0b80b.pdf
    • http://gagewef.vomnemeanlion.com/uploads/1/3/0/7/130775537/2129771.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/karl_marx_conflict_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4835/files/jewer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/21900181279.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/jipitijesuzaxej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/86342330387.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5402/files/novapoxinalutigako.pdf
    • https://cdn.shopify.com/s/files/1/0435/2324/4191/files/wuxisole.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/lufirijuvukevugidefiniw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/9127453479.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/58889143744.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/mekalepokomaguz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/38099813278.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_off00006728.bin
f5f5fb02e037fae5ddcc63243fe2483c1e716a8460238b39cfe8f9ca8e8be21d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 5148 bytes
font_01_sfnt_off000078c4.bin
6b95814cef49b08e603cbda90ad786be7194068ba71a124a42448ecf826946c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 24028 bytes
font_02_sfnt_off0000ae89.bin
381eedd9418bc5e5d24f15c0e1be6b5bc4a6c77fa20e4d913b49b88c3dbbc504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 16372 bytes

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