Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443c37a6aeeb66d…

MALICIOUS

PDF

36.4 KB Created: 2020-08-30 22:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4f40f1638ec878975f495765453f31 SHA-1: 5faf67c9694b5bdb7d6bdac4cde70bea0a789860 SHA-256: 2443c37a6aeeb66dba27ad4e741a56d9ac30d1e993b6294ffdca5adbe579911d
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 document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure the user to a potentially harmful site. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt.

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/wix?keyword=why+looks+are+the+last+bastion+of+discrimination
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/js_regex_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/6872/6171/files/29819237669.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/77338630489.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/bexoxosozipuwot.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/nozawepasuzuvubasiguru.pdf
    • https://static.usrfiles.com/ugd/b8c837_1222179c8d6948a5a40eb6c91c9f5962.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a170d6036a546aa9b51957d70289254.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e238e609754ece8cb303595b7fac41.pdf
    • https://static.usrfiles.com/ugd/455f95_e48e12a1637048d98e4b428b1a72e167.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/bogegesufem.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/bring_it_on_home_to_me.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/balaji_inorganic_chemistry_for_neet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/zizawabojubibovesexag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2583/files/38321914057.pdf
    • https://static.usrfiles.com/ugd/b8c837_14170206c1c74eaca49206bd59230354.pdf
    • https://static.usrfiles.com/ugd/ade4e6_ab470d76910d477694b53c670425761c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd40c3fd57164031a5621a046f512770.pdf
    • https://static.usrfiles.com/ugd/0b46e6_815436d348e447d39f2c4f22c335c90f.pdf
    • https://static.usrfiles.com/ugd/1b8612_c8d0c0de13164852bdf69b42d4c8303e.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://static.usrfiles.com/ugd/b8c837_cd40c3fd57164031a5621a046f512770

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005007.bin
164ddf50e64deaabe0982be8b40f6dc24cb855abe5643cc05e88b58237cae285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5007 5580 bytes
font_01_sfnt_off000062e2.bin
7bafe19f23a9507f742c2ff6347f0a482ea60bce8401a704ae1f5513ce2f49e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 9836 bytes

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