Malicious PDF — malware analysis report

Static analysis result for SHA-256 c980170c62b6961b…

MALICIOUS

PDF

62.0 KB Created: 2020-08-30 16:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca9c0abe716f99846cf413aeaaeb9d32 SHA-1: 13c31149658da25fe7990f1eeaadcb4a207be973 SHA-256: c980170c62b6961b42449691960d155c2a5310f11f22bc6a60ebb54bf4f460f8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary URL, https://ttraff.ru/wix?keyword=netpro+mine+indir, is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to static.usrfiles.com, suggesting a link farm designed to distribute malicious content or conduct phishing. The ML classifier strongly supports the malicious verdict.

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=netpro+mine+indir
    • https://static.usrfiles.com/ugd/b8c837_9b91d50b68614c46803039793415de73.pdf
    • https://static.usrfiles.com/ugd/cdb50c_76a1eecfc87d45e7ae6c73e41fed8461.pdf
    • https://static.usrfiles.com/ugd/409ca8_8a3c60f763de46548146129fab3d70bc.pdf
    • https://static.usrfiles.com/ugd/81d6a4_84cae2afe3d74f9e8f32c823286ef40d.pdf
    • https://static.usrfiles.com/ugd/921909_3e5daa7d0a9944358783a8841e447003.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_10e988b2f11b4f66ab1ea3b690656e35.pdf
    • https://static.usrfiles.com/ugd/b8c837_96a059437a0649ac9aaf8f377b63c9d4.pdf
    • https://static.usrfiles.com/ugd/c1108c_b2e093cdf81c4651a4b12c6ab1221b84.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a52eb78221f4fe49f00f493dab48e00.pdf
    • https://cdn.shopify.com/s/files/1/0461/6739/2419/files/autodesk_inventor_professional_2015_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/97090796568.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9773/files/40327693541.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcf35407fab42aab17ac4e20d9a7c69.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c7ca42a9a1147c2a5e7db55848aa109.pdf
    • https://static.usrfiles.com/ugd/df4650_f2a346810524491ea67ad0606280012c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac398deca5044b7582632b355e49fdfb.pdf
    • https://static.usrfiles.com/ugd/fb83f1_7e97116bd940493487aa29a4cb191746.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_off0000a7fa.bin
caa9fbf4e9424dc546f5a943b8e4ba8b74b8ce544bbfd92ab198531ba6a95360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FA 4656 bytes
font_01_sfnt_off0000b7b6.bin
38567f822cab0c240513c016edcd566ba29e7914179aad3ce8c5141f36bbbb22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 16724 bytes

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