Malicious PDF — malware analysis report

Static analysis result for SHA-256 0deef7a4b6dcdf3c…

MALICIOUS

PDF

66.2 KB Created: 2020-08-30 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e59b0528150180c1390e2f66fb20ad87 SHA-1: 3e07749e9409589df98c4c4864164f7852029e25 SHA-256: 0deef7a4b6dcdf3cd26d7ead0728852bd4173cff9946cbf43bf3a33abf9e0e0e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector's target. The presence of numerous external PDF links suggests a link farm, potentially used for SEO poisoning or to distribute further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=what+is+adverb+clause+of+purpose
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e90bf73675f04c30b8fc7ed03ca40738.pdf
    • https://static.usrfiles.com/ugd/0f5b72_b8af620982194c78bac98316f1c5b340.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e8dabb33c44878b688fbbec30ba2a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc34b97dcaa74938b16abff6b346559c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ed75cfebe6046b6a65ea0b82b94befb.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_4e468dabac0743bfb321651b9f8ab531.pdf
    • https://static.usrfiles.com/ugd/3f80ec_1e4eeb30645d4e79bcb9c4c5b54fdfbe.pdf
    • https://static.usrfiles.com/ugd/95089d_ff0ccb4c5e2a4bd2aca1ef50078399ca.pdf
    • https://static.usrfiles.com/ugd/eb6612_31db11ce240d451cac2fca8506840b61.pdf
    • https://static.usrfiles.com/ugd/493135_9878fbd43bc2418f83f9a51549cd6ee6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c9c9cb729df4c818de01045768e1714.pdf
    • https://static.usrfiles.com/ugd/b8c837_687432d7fb5a4018b283f64ed50952c2.pdf
    • https://cdn.shopify.com/s/files/1/0437/8581/4177/files/gagawulesizokubep.pdf
    • https://cdn.shopify.com/s/files/1/0437/0687/6055/files/cyclone_key_install.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/87899017165.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/47232282341.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f6.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 2828 bytes
font_01_sfnt_off0000c3f0.bin
a10e5c5396b640f33a059494d78ef29eeb0164f52e2b357432deeb8de2941019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 5456 bytes
font_02_sfnt_off0000d681.bin
935a63d5c7ca507bd5b5bc2df294a19478e9b2736658da858e5695274ab6acb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 11088 bytes

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