Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5695d9e80347b8…

MALICIOUS

PDF

45.0 KB Created: 2020-09-01 09:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db8ce45b6acf154b7861db6f9606f00a SHA-1: 2819e338ee01b5e71fc9f0a544dc38d519551674 SHA-256: 6b5695d9e80347b8d3615a39a5fed3748f4f2eaf36aa4f1820fe9936f6888e55
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Kelly services timesheet' and a URL that appears to be part of an advance-fee scam lure. The presence of numerous PDF links suggests a link farm designed to obscure the malicious redirector.

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.
  • 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.
  • 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=kelly+services+timesheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0cd3a8_7082900bb18c40eb92120724c0f9dd5c.pdf
    • https://static.usrfiles.com/ugd/4b874d_ce3d680063474e4d9f7e441a0c104d15.pdf
    • https://static.usrfiles.com/ugd/105a8c_61aee9b1c4fe451d851df5c97230752b.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/carbonatao_forada.pdf
    • https://cdn.shopify.com/s/files/1/0440/0939/0238/files/sezidewedutujodolapo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/barbarian_assault_guide_osrs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/86709919809.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/adobe_acrobat_reader_pro_cracked_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3851/files/54310681612.pdf
    • https://cdn.shopify.com/s/files/1/0454/7431/6454/files/83710216629.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/23585601044.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/yantai_jereh_oilfield_services_group_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/27910723950.pdf
    • https://cdn.shopify.com/s/files/1/0434/5446/4165/files/dufaxamibawenasuga.pdf
    • https://cdn.shopify.com/s/files/1/0454/2342/7752/files/english_to_tamil_conversation_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000705e.bin
def3d99bb99eecea33edb232f0537522af0ed946e6527706f12c04b3c8076c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 4960 bytes
font_01_sfnt_off00008129.bin
6ad1af551842bc957355b3d7d62f07466b4b5b09d1f42690f9aa0ed48376aa97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8129 11320 bytes

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