Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed3be664d9e88ea…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 05:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39f7ea2d1cf3a5326443e290bfe9aee6 SHA-1: 2fd440107ea521bacdee453099ce53032df77771 SHA-256: 1ed3be664d9e88eaa75f4786c64a36bdbe5eb4fbc4695f8425f57c234f14ceb8
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to a malicious site. The presence of numerous Shopify links, while many are benign, indicates a link farm strategy, likely for SEO poisoning or distributing 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=room+on+the+broom+text+pdf
    • http://files.suefortgensartandprints.com/uploads/1/3/1/3/131381237/8168865.pdf
    • http://files.skatehawaii.org/uploads/1/3/2/6/132695698/f1affcc022ef4.pdf
    • http://files.simonkennedy.org/uploads/1/3/2/7/132740778/dimotilenasiranofif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/3589602959.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/gurobasofezewedagolije.pdf
    • https://cdn.shopify.com/s/files/1/0437/2326/0058/files/apc_back_ups_cs_350_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/0321/3984/files/talejedupomaxifutakonolep.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/30698104413.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/nogarenez.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/wemogewefiwuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/80443812114.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/sepurusumikikaraluforofus.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/28459808482.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/258029835.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/economic_budget_2020_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0438/0704/7840/files/59299678241.pdf
    • https://cdn.shopify.com/s/files/1/0435/4591/9652/files/96023530319.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/16995962427.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_off00006b18.bin
5734fd61d9ebb3e4d5fb94ccd350bb7115e67be91d0859379c59c0bb925a3c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 5076 bytes
font_01_sfnt_off00007c38.bin
a9569a4471392d5594d623dcf64560fb25c599e17dda2d484bd199369cc05d62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 12448 bytes

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