Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3fbb0b8b57f939…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 21:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8340ae8e6e9d5d3daf408d6267c1550 SHA-1: 1490fd6c6013274f04d8b1d5dcdf9227c2779403 SHA-256: 4d3fbb0b8b57f939c3e099a78e4f03d898bb7e8ce503afbaf403fa007359ca28
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a malicious URL, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the same malicious URL and references to 'centrifugal pump parts and working pdf', suggesting a lure. The presence of numerous embedded links, many hosted on shopify.com, further supports the link farm heuristic.

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=centrifugal+pump+parts+and+working+pdf
    • http://files.eimtaiwan.org/uploads/1/3/1/6/131606876/9f87eb5e3346efc.pdf
    • http://files.nanolab.info/uploads/1/3/1/4/131438420/4184303.pdf
    • http://wizuxitaz.thefourthchoir.com/uploads/1/3/2/8/132814930/temajolapod_sapowumomadono.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/39634843264.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/china_ems_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/sosobebesevefadozukebame.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/68052471190.pdf
    • https://cdn.shopify.com/s/files/1/0434/0137/9996/files/97717150885.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/13457861195.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/motionjoy_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/einstein_bagels_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/24713264705.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4308/files/69075726453.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/gixotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/zozozukapu.pdf
    • https://cdn.shopify.com/s/files/1/0447/9975/4397/files/kalnirnay_calendar_2020_marathi_september.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_off000073fa.bin
bc5ba89503f91d82591035a627b26182e7d135e56305089fccb93b4636c782fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FA 5424 bytes
font_01_sfnt_off00008664.bin
f97544dfaf467935c532992a652fffa446b52bd83cd98ca45cd8d6ae34dc603e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8664 10380 bytes