Malicious PDF — malware analysis report

Static analysis result for SHA-256 71413492554a933a…

MALICIOUS

PDF

78.2 KB Created: 2020-08-11 12:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63f3a0c0980e7206a7099604a39bee74 SHA-1: 0fc6de58585b65cb3633c96808a39b953ec37a6e SHA-256: 71413492554a933adf78e5a95e55b98e1f2e4b73a33eeb9901e40afe5746890f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector URL disguised as a document about LDAP commands, which is a common lure for phishing or malware delivery. It also hosts a large number of links to other PDFs, suggesting an SEO poisoning tactic to increase visibility and traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points to an attempt to lead the user to a compromised or malicious site.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=ldap+commands+in+linux+pdf
    • http://files.moesoap.com/uploads/1/3/2/3/132302999/cf6696aef6.pdf
    • http://dijux.tucksdoghouse.com/uploads/1/3/1/8/131871390/6409968.pdf
    • http://files.blowingoakfarm.com/uploads/1/3/1/6/131606289/mesisodepogozep-gotipulabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5704/5916/files/sazejojipu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7575/files/21692154893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/frc_game_manual_2017.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/jevorunale.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/zosofopomapezifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0324/0871/files/enlaces_quimicos_bachillerato.pdf
    • https://cdn.shopify.com/s/files/1/0431/6872/7194/files/16114025821.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/98676037201.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/free_air_fryer_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/gizitog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/tepevijekitidoperal.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_off0000de98.bin
ff5992f5bd9dedf343fcb1267ef7b241fcb9b925ba5c072b81a9e7960cc531fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 4900 bytes
font_01_sfnt_off0000ef21.bin
7aa8928156f33fbba2f35b2d144d5c836ce36bc5472a931313c44add73b158da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 14764 bytes
font_02_sfnt_off00011e13.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 4324 bytes

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