Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35c5f76c0c87568…

MALICIOUS

PDF

47.0 KB Created: 2020-07-30 07:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990ef75ec8a158335675d5bc71b422b8 SHA-1: b3a566f8ff697cae9e8913ae32cc3aa86a55c19a SHA-256: c35c5f76c0c87568b470296d1b0f2348dbb93df48dc5857646ab6c5a2865c3cc
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'A level english literature books pdf'. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', further supports a malicious intent to drive traffic to potentially harmful sites. The ML classifier strongly indicates maliciousness.

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.com/pify?keyword=a+level+english+literature+books+pdf
    • http://files.polillio.com/uploads/1/3/2/7/132740270/bazijowexamajed_bexunoru_kapixu.pdf
    • http://files.victorystrengthandfitness.net/uploads/1/3/0/7/130740012/sisuruxuve.pdf
    • http://files.bigbellceramics.com/uploads/1/3/0/7/130738534/cdf99778.pdf
    • http://files.canyonridgepta.org/uploads/1/3/0/7/130775952/volalebekuzujuj.pdf
    • http://files.charlottehighersoriginalart.net/uploads/1/3/1/3/131397946/cca53.pdf
    • https://cdn.shopif
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/97768147926.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/bovomudadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/palulobeten.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/1594943439.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/24080765080.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/bixigezo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/gitalafefulomogovoxudilop.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/musudovi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/84038788085.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/27129333866.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/52032741036.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/99686017400.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/13464743752.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_off00007839.bin
fe2584eff53a3e9534ba73bb858639e4bd771b2412419fc5466cffaa54f1ad35
pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 5436 bytes
font_01_sfnt_off00008aaa.bin
d9b2554825c9cfbd889a640472ec9a32ee3c99de131c52017feb44a0185b7d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAA 10016 bytes