Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c95da24d8b0950…

MALICIOUS

PDF

47.5 KB Created: 2020-07-27 14:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8358e0abc92fa012ec62cff724881902 SHA-1: 2a1a651497e10e8500279c4f990bf159af266f06 SHA-256: f7c95da24d8b095030c9def001a944897dc82b2f284b7a40cef474436d8ab8d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to software installation, suggesting a lure to trick users into clicking malicious links. No scripts were extracted from this sample.

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.ru/pify?keyword=android+studio+linux+mint+install In PDF document text
    • http://files.speakingoutaboutsuicide.com/uploads/1/3/0/8/130813557/8842000.pdfIn PDF document text
    • http://files.hk100-ultra.com/uploads/1/3/0/7/130738755/pilewem_bibudeditisazuj.pdfIn PDF document text
    • http://files.shannonecameron.com/uploads/1/3/2/6/132695430/953582.pdfIn PDF document text
    • http://files.catherineodriscoll.com/uploads/1/3/1/4/131452887/6873501.pdfIn PDF document text
    • http://files.braceletluv.com/uploads/1/3/0/9/130968994/1589905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/69276379675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/4946403833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/vakarokodejakofudimize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/45811238345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1203/6520/files/41385266604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/93875660723.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9875/0619/files/44015358762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/40721759317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/71823816757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/44529427342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8577/4502/files/89660163328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/91129049893.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1077/6484/files/17521800792.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/tenotu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7B 4792 bytes
SHA-256: 248c19615886d5d7b6b6ecaf59f3ca9f9e4899f7cfbe5388d848243d8a442535
font_01_sfnt_off00008a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A96 11088 bytes
SHA-256: ab2beec1165fbb18e67668a5a15bdde2da41bf9295cd3d473a1399258f726253

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