Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f32c9fa9824acf…

MALICIOUS

PDF

34.7 KB Created: 2020-08-30 06:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12e40ba08bbc0e111375218e4b10aca2 SHA-1: 0c4dc7237d71836be0760d0c56336db2eed1589c SHA-256: d9f32c9fa9824acfbd10bbb4611ad89f12fec873baf627b6b2a6488d59d2f072
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, many of which point to a link farm infrastructure. The primary redirector URL is https://ttraff.com/wix?keyword=10.s%2525C4%2525B1n%2525C4%2525B1f+almanca+ders+kitab%2525C4%2525B1+cevaplar%2525C4%2525B1+meb+yay%2525C4%2525B1nc%2525C4%2525B1l%2525C4%2525B1k+a1.2, which is known to host malicious content. The document body appears to be obfuscated or corrupted, but the presence of numerous SEO-optimized PDF links suggests a campaign to lure users to malicious sites, likely for phishing or malware delivery.

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.com/wix?keyword=10.s%2525C4%2525B1n%2525C4%2525B1f+almanca+ders+kitab%2525C4%2525B1+cevaplar%2525C4%2525B1+meb+yay%2525C4%2525B1nc%2525C4%2525B1l%2525C4%2525B1k+a1.2
    • https://static.usrfiles.com/ugd/0047a4_9060d1d4fffb42f89a4bb2a6f04c85c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a90dd225c32e41e8af431106ff17fda3.pdf
    • https://static.usrfiles.com/ugd/384ea4_f082c2d7f4be4b76b8a2d9f628d98791.pdf
    • https://static.usrfiles.com/ugd/158fb9_2fd12267161145dbac23a1e8da83ff76.pdf
    • https://static.usrfiles.com/ugd/79e5df_0f56f38db04945b396b148d71745f7a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_24701f51696246a39130affad968ae1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_43597533810547daa7ba4c2ad732d0a5.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_45d52cb224374557b2be1ebd248793d9.pdf
    • https://cdn.shopify.com/s/files/1/0433/4354/4488/files/99298725823.pdf
    • https://cdn.shopify.com/s/files/1/0435/0482/8580/files/raising_cane_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6629/files/wamuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/jituwudawoboberafute.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0455/4385/0149/files/bessel_filter.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/35822956243.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_off00004771.bin
8e9f27a9ec872395d3a069ab4095c55a38278967021b489b6168f8d9905dc4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4771 5960 bytes
font_01_sfnt_off00005ba7.bin
319682c315006bb72219351d31b15e8f3cb55cfbe07b98106d2bf8760aebbf8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA7 9144 bytes

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