Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fb2c5e830e1fa9…

MALICIOUS

PDF

111.7 KB Created: 2020-09-01 03:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6068dc2621759396882745de887e2484 SHA-1: f81c6bd69712abfd7830faa491759ae26d0c1785 SHA-256: 11fb2c5e830e1fa9615b24b78d23d5a04a5bf3446ee93118c9bec7029d4374ed
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by an ML classifier and contains a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to an exam answer key, which serves as a lure. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.ru/wix?keyword=upsc+prelims+2016+answer+key+with+explanation
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9219f8_92f53a81192e4feda0880e1f847c6fa7.pdf
    • https://static.usrfiles.com/ugd/2c608b_598b1b5c50ec4d53a8a4166a2b6fe064.pdf
    • https://static.usrfiles.com/ugd/8b4172_b6ac24ef694147cf8c2cdc250034c1b5.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/valvoline_oil_filter.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/28601762623.pdf
    • https://static.usrfiles.com/ugd/1e32c2_a64b1214fde54105ab32c037ca4fa508.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb33a94129224f33a0713f8beccb0603.pdf
    • https://static.usrfiles.com/ugd/432b07_6f6d7f9a42ed4c9a988139c64a609e72.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/ad2ade_e945cf7202554a208dbe4b7f3a2183bd.pdf
    • https://static.usrfiles.com/ugd/50de67_0b429bb1d09740668038938971eb43a9.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_off00016b1a.bin
198332f8ea07d48284794fe0b07ae31cf77c3b8fac6255cbf9a4cb4aebb87185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1A 5972 bytes
font_01_sfnt_off00017f5c.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5C 1800 bytes
font_02_sfnt_off000187e9.bin
3ca94090987d252fe632f95c7974edf2ca299b624680f10a8a9297088637160d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187E9 12784 bytes

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