Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04dbb3d4333d1e8…

MALICIOUS

PDF

55.8 KB Created: 2020-08-24 15:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 646a3ce1319a2433196bdf5ceab810d6 SHA-1: 2c1c1ffa192c5542b017f21d740dfafbe538f18b SHA-256: f04dbb3d4333d1e886dd76ae05800dc63c480defb8d57da00ae48bab7a2f2742
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Derivatives of logarithmic functions worksheet pdf', suggesting a lure to disguise the malicious intent. The presence of multiple PDF links, many pointing to Shopify domains, indicates a link farm strategy to distribute malicious content.

Heuristics 3

  • 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.
  • 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/pify?keyword=derivatives+of+logarithmic+functions+worksheet+pdf
    • http://files.hideawayfarmar.com/uploads/1/3/0/7/130740573/pipevoponakigukukim.pdf
    • http://files.hannmfg.com/uploads/1/3/0/8/130813364/4cd82.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/sheet_metal_gauge_thickness_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7618/files/bajar_aplicaciones_para_android_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/linobutuvabuwixebiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/rodopepisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/rowakenudupadizozux.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3534/files/vuruni.pdf
    • https://cdn.shopify.com/s/files/1/0461/9334/4670/files/79227754409.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/64852841917.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/68557787938.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3569/files/doxexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8992/0154/files/cards_game_king.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bb9.bin
d53068f9b08ed66933a0ca4648ff81cd88cc10c10f3cbbbaddb58a0c3e9b1abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 5784 bytes
font_01_sfnt_off00009f67.bin
e4369b7e0a2a6240135bf308d57d9b6aed8a6bd4f0851f7495e37e1a30872b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F67 16192 bytes

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