Malicious PDF — malware analysis report

Static analysis result for SHA-256 0588b81ca0124274…

MALICIOUS

PDF

49.5 KB Created: 2020-08-10 10:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c13f33dde02a54b1acca7b74a7084df SHA-1: f3fa9948b1b25fad6e799df86b0912e008e88ba9 SHA-256: 0588b81ca012427434ed239710219b83cb1005d546c46dc4bd9e8032c3467903
154 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 infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external PDF links suggests a link farm designed to obscure the true destination or distribute further malicious content. No scripts were extracted, but the primary attack vector appears to be the malicious redirection.

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/pify?keyword=equidad+de+genero+ni%25C3%25B1os+pdf
    • http://files.satindollsbundles.com/uploads/1/3/1/3/131381804/wilaweratowuw_wiremejat_budefu_dulip.pdf
    • http://files.tracyandstacy.com/uploads/1/3/0/8/130813755/644857.pdf
    • http://files.beachcitiesrockclub.com/uploads/1/3/1/6/131606789/sogefubinudavud-numafukoradidot-kubepigifagobu-dovopevudobex.pdf
    • http://files.andersonolineacademy.com/uploads/1/3/1/8/131858916/sekagedoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/8812/4835/files/42767850673.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/93815882307.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/52434907684.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/vegogunapagujatorunex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/voganoxugatufakiwexekakaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/nufifa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/vufutefajeruzuzisubiroju.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/33964931288.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/fizizetefozosalorobila.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/xcode_5_rails.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/rixuli.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/fijevedubananunar.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/89719839728.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/tudazipokusu.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/les_adjectifs_attributs_et_pithtes.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_off000071f3.bin
eb199e0b554313f3ebd4fbe0efc6ee3925e4772dfd614741eab05efe0a7ed677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F3 5272 bytes
font_01_sfnt_off0000839d.bin
fd39f7bd6aab4b15c97a86c0d0a2e3a9817fbc8d782a2c9c3e39b24c7311e8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x839D 11496 bytes
font_02_sfnt_off0000a8e1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E1 4324 bytes

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