Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e81bec28b3f758e…

MALICIOUS

PDF

37.1 KB Created: 2020-09-07 20:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5427457aacaae2ab8da730013badca8d SHA-1: d50436f89d0de2f3d0bdc8421ee65b7a1d55ac65 SHA-256: 1e81bec28b3f758ece05d29d90ebeb8a3540cf1b192d33a14148536a07332440
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that promises 'slader geometry workbook answers'. This URL is likely a lure for phishing or malware distribution. The document also contains a mass external PDF link farm, with many links pointing to static.usrfiles.com, though these appear benign. The primary malicious indicator is the redirector URL.

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.me/wix?keyword=slader+geometry+workbook+answers
    • https://static.usrfiles.com/ugd/23924c_74016f29a4d8450e92045d5941f2d90a.pdf
    • https://static.usrfiles.com/ugd/cf14a4_8b87817b71e84f97af82f0dc3172ee73.pdf
    • https://static.usrfiles.com/ugd/34e21e_75b42b97e3824f5794c560b553483ff0.pdf
    • https://static.usrfiles.com/ugd/3ce946_06f94170d2254795accf75278e90582d.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/64206825537.pdf
    • https://cdn.shopify.com/s/files/1/0429/1847/7987/files/pathway_bronkitis_kronis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3188/6998/files/62949634770.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/customizable_camera_skyrim.pdf
    • https://cdn.shopify.com/s/files/1/0450/7874/1155/files/wojarutolajasezube.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/10686711838.pdf
    • https://cdn.shopify.com/s/files/1/0439/7396/8030/files/anarkali_of_aarah_full_movie_filmywap.pdf
    • https://static.usrfiles.com/ugd/6da380_f178e8441f2a4d9e8c8679287b55fa1f.pdf
    • https://static.usrfiles.com/ugd/ee4d88_a8524aa6d88248b7a9e2d02c88cb03c5.pdf
    • https://static.usrfiles.com/ugd/d1d005_000ecfc2fac7414ebe7faa9a25ab7755.pdf
    • https://static.usrfiles.com/ugd/2f7815_6de290695d7a46d7a8766823b22073f7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000466f.bin
fdbaef96ee674a9f5c569f7792c4fb7efb200d9416cf2ed5c1c365f5d5feb165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x466F 5388 bytes
font_01_sfnt_off000058b2.bin
cccf9b7cc671f95809ade3ebcdd21cd96864da5d251c00d3d921827e85287c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B2 9552 bytes
font_02_sfnt_off0000794f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794F 4324 bytes

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