Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fc92ba7e15eefe…

MALICIOUS

PDF

61.7 KB Created: 2020-07-31 13:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3dce5ef5404b137aeea6504bc77fc5a SHA-1: b2bb541380b312f7a8cec36b84a4ea779c7d784d SHA-256: d2fc92ba7e15eefed71f1054e8235d470ecc5788fc216506c111b75e81e91fb7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to host malicious content. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'English romantic short stories pdf free download', suggesting a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=english+romantic+short+stories+pdf+free+download
    • http://files.emeraldacresaldergrovebc.com/uploads/1/3/2/7/132741020/4f0d06d5bc.pdf
    • http://files.jessicagephart.com/uploads/1/3/1/1/131164452/golijarudul-zetudupojelifo-sarenupo.pdf
    • http://files.trinitybergenlutheranchurch.org/uploads/1/3/2/8/132815370/5803591.pdf
    • http://files.lolas-ecec.org/uploads/1/3/0/7/130775241/nedosodujaf-semeguped-netuvamufurorob-gasan.pdf
    • http://files.kelvingibbons.com/uploads/1/3/1/6/131607712/supagadanipaxinixej.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0070/files/71297918912.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/21389706108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/vedunodiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/togosemijidijot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/83422235220.pdf
    • https://cdn.shopify.com/s/files/1/0428/8187/6131/files/kerinaxuzejirovujikupofef.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/negozutajuzebelabolifig.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/9601662297.pdf
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/14659983039.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53151925343.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/65741837367.pdf
    • https://cdn.shopify.com/s/files/1/0433/8515/9843/files/gowanodifuzajig.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/lomubixixe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.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_off0000b303.bin
92cf6a71d659cdf348e4015bb2ef59895f842e5326718f8226ec507c892f69d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 5408 bytes
font_01_sfnt_off0000c541.bin
e635dc7f288c38fa208729a3109cf11c15d9b7cb411403875c92120aeed40536
pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 10508 bytes